Signed-off-by: Rémy Coutable <remy@rymai.me>

The 'Create new' dropdown is no longer available on a blank project
so use the 'New file' button instead.

Continues the iteration on the project overview UI:

- moved star, fork and new clone button
(copy SSH/HTTPS URLs) to top right,
  made them smaller
- avatar is now larger (64px)
- 'Request access' is now a link instead
  of a button
- overview comes before the description +
  changed styling and added icons
- description font-size is now 16px (large-paragraph)
- quick links to files are moved downwards
  below the commit/pipeline info
- margins changed to group content into
  4 groups to clean up the interface
- visibility info reduced to icon-only and
  moved to the right of the title

Adds tests that adds new files via file templates via the Files view
and the Web IDE.

Includes changes to page objects and associated code

Fetches template content from the API rather than hardcoding strings
that will need to be updated if the templates change. Some of the
content is stored as flat files but we can't use them because they're
not included in the docker images gitlab-qa uses.

Closes #44477

This also makes the IDE generally available

spec fixes

[ci skip]

Closes #38614

Fix
https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/12198#note_37146360