Move issuable bulk edit form into a sidebar

This MR moves Issue and MR bulk editing into a sidebar.

Some additional changes were made to improve maintainability of the code:

• Standardized naming across filenames, selectors, JS variables etc. to use appropriate variations of 'Issuable bulk update'. There were several different naming conventions describing the same feature including 'bulk edit', 'issues bulk assignment' & 'bulk update'.
• Changed the name of Issuable to IssuableIndex and updated references to it, as it is more accurate and less confusing.
• Removed some orphaned bulk update code which had fallen out of use (app/views/shared/issuable/_filter.html.haml)

Closes #28340 (closed)

added 172 commits

• 6b1912bf...67312fce - 171 commits from branch master
• 8ce1c020 - Get rough prototype working.

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unmarked as a Work In Progress

changed title from WIP: Resolve "Mass edit issues and MRs from sidebar" to Move issuable bulk edit form into a sidebar

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• ea6d0721 - Ensure page content shrinks for right-sidebar.

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• 38c4b43c - Break out sidebar logic into its own class/file.

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• c431585f - Rename Issuable to IssuableIndex.
• df83d14e - Move issuable.js to issuable_index.js.

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• 83d1a905 - Fix toggle selector.

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• 93991aa8 - Fix check all logic.

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• e18f9a33 - Add bulk edit toggle to MRs.

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• 1b21985a - Remove stray debugger statements.

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• 534e14e2 - Change bulk edit submit button to Update all

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• 2abf823e - Standardize naming on 'bulk-update' and variants'.

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• b66b79c4 - Standardize naming on 'bulk-update' and variants'.

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• 94a8580f - Abstract out bulk edit state change logic into toggle methods.

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• 1e184757 - Improve dependency chain and fix issuable_ids hidden field missing.

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• 2e3f4cb2 - Remove unused enabled-content class.
• f0ecdc0c - Use button tags instead of plain button element.
• cd2360ac - Remove unneeded comments.

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• 20fdf322 - Move bulk_update_sidebar into its own view.
• 0d5eb330 - Move bulk_update_sidebar into its own view.

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• e4b71824 - Move bulk update sidebar out of search bar and up a level.

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• 60e0f4a6 - Used cached ref for update_issuable_ids.

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resolved all discussions

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• 5002c856 - Use consistent spacing in JS.
• 9fb98098 - Initialize dropdowns only when bulk_update view is loaded.

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• 6dd85594 - Fix dropdown is-default styles and fix dropdown toggles.

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@cperessini I still need to get the code reviewed and the build passing, but can you check out this branch and review the UX?

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• e551f998 - Shush eslint.

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• eb3e4e56 - Fix Issuable specs.

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resolved all discussions

added Deliverable frontend labels

changed milestone to %9.3

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• efd80f59 - Remove stray fdescribe.

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changed the description

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• 259b7556 - Fixup specs and code to eliminate noisy failures.

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• 5fc76425 - Fix willUpdateLabels and dropdownData.

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• 3a6d1d5d - Ensure dropdown state is update on checkbox state change.
• 07933d3c - Get tests passing.

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• 49fc8f1b - Clean up sidebar js.

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• 6428af4d - Shush eslint.

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• d8b2cdd6 - Fix ref to static method, and shush eslint some more.

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@iamphill I thought you'd be the right person to have review this -- do you mind? Btw, I made some notes in the MR description that might help orient you

assigned to @iamphill

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• 0b24053d - Shush eslint.

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• 0b24053d - Shush eslint.

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• 0b24053d - Shush eslint.

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• 9537e224 - Fix up update issues and merge requests specs.

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Haven't checked it out yet to test yet.

assigned to @brycepj

Based on your gif, it also doesn't match the designs https://gitlab.com/gitlab-org/gitlab-ce/uploads/2bf7a45451b4abe0c5e9172f5872794e/mass-edit-issues--sidebar.png?

Haven't checked it out yet to test yet.

That's fine, might as well wait on it til I've addressed your feedback.

Based on your gif, it also doesn't match the designs https://gitlab.com/gitlab-org/gitlab-ce/uploads/2bf7a45451b4abe0c5e9172f5872794e/mass-edit-issues--sidebar.png?

@iamphill I had @cperessini review, and he gave the on UX. Can you be more specific about discrepancies you see?

@brycepj If the UX have given it a then i'm all cool!

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• 765d4971 - Make CSS selector related improvements to IssuableBulkUpdateSidebar.

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• 765d4971 - Make CSS selector related improvements to IssuableBulkUpdateSidebar.

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• 92cc75f5 - Refact issuable bulk actions to be a singleton.

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• f9ddb1ab - Use button default.

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