Make small improvements over well.css files

- Fixes thinner right border on the limit box
- Adds and 'elsif' on @branches for the scenario in which a commit is not related to a branch
- Fixes small details on limit_exceeded_for_message partial

- Improves CSS files by reusing existing code
- Changes logic in views to avoid future problems in translations

- Display the default branch (if the limit is not exceeded)
- Requires '...' to be clicked before showing the rest of the branches and/or tags
- Fixes haml lints

- Create a partial for limit exceeded message
- Modifies specs to adjust new scenarios

- Leave 'too many tags to search' always visible
- Add different message to the branch/tags so it states its unavailable

threshhold, a message is shown indicating we didn't perform the search

the long running git query

Simplify project page

Closes #37399 and #38839

See merge request gitlab-org/gitlab-ce!14669

Developer can create/edit/delete milestones

See merge request gitlab-org/gitlab-ce!14797

QA group name, use hyphens rather than underscores

See merge request gitlab-org/gitlab-ce!14786

Enable eslint in star and remove from main.js

See merge request gitlab-org/gitlab-ce!14795

Use ES6 modules in labels and labels manager

See merge request gitlab-org/gitlab-ce!14794

Add image discussion docs

Closes #38879

See merge request gitlab-org/gitlab-ce!14743

Refactor the Development documentation, and divide the Testing documentation into multiple pages

See merge request gitlab-org/gitlab-ce!14512

Update Kubernetes Helm chart docs

Closes #38828

See merge request gitlab-org/gitlab-ce!14717

Add explicit test to test resolved discussion toggle content

See merge request gitlab-org/gitlab-ce!14796

Decreases z-index of select2 to a lower number than our navigation bar

Closes #36160

See merge request gitlab-org/gitlab-ce!14768

Remove not selector increasing specificity of rules

Closes #38958

See merge request gitlab-org/gitlab-ce!14789

Locked issues / mrs docs

Closes #38880

See merge request gitlab-org/gitlab-ce!14770

Fix unable to expand text diff discussion comments

Closes #38940

See merge request gitlab-org/gitlab-ce!14792