Disables the vue-i18n eslint rules for files
that are not able to be autofixed, this will
stop these offences causing pipeline failures
but they will need manual fixing.

- Compare versions header is full width except in the unified diff mode
with no tree sidebar
  - Bar is always full width, but the content within stays centered when
unified and no tree sidebar
- File header is the same height as the "Compare versions header"
- aligns with the design system grid guidelines => 56px
- Diff file headers use a button group, switch icon order to open file
externally being the last option, all buttons will become icon buttons
(icon delivery by @dimitrieh)
- If a file header becomes sticky no rounded corner/double border
problem is visible anymore

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/51737

Put the statistics in the compare-versions header for the entire MR
Put them in the file header for each individual file

Dropdown includes buttons for tree view rendering mode
and buttons for the compare view (inline or side-by-side)

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/55491

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/53019

See https://gitlab.com/gitlab-org/gitlab-ui/issues/89

This restores the behaviour of showing the expand all button on diffs
even when only a single file is collapsed.
Previously the button would only show when all files are collapsed.

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/51737

This file tree displays all the diff files in a tree like format
Each file is taken and converted into a tree with folders
Each folder can be toggled open & closed
Clicking a file will scroll to the diff file & highlight with a glow affect

Searching the tree list will search only files & return a list of the
files without any folders

Each file row contains an icon to show changed, new file or deleted
Each row will also contain the added & removed lines count

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/14249