Selected data is added into a different array

Changed what is hidden when data is loading

Adds issues to list on frontend - need to push to backend

Fixed modal not closing on cancel clicked

Submit button disables/enables
Submit button selects ids - but does not push it yet

Possibly need to change masonry library but so far it is the only one I found that works well

This removes the backlog list & instead creates a modal window that will
list all issues that are not part of a list for easy adding onto the
board

Closes #26205

PlantUML support for Markdown

Closes #4048

See merge request !8588

Backport changes from EE squash

See merge request !8912

replace `find_with_namespace` with `find_by_full_path`

See merge request !8949

Force new password after password reset via API

Closes #24606

See merge request !8933

Backport changes from the EE-only squash implementation, which would
otherwise conflict when merge CE into EE.

<https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/1024>

Update installation docs to include Docker, others

See merge request !8943

add complete changelog for !8949

Allow rendering of PlantUML diagrams in Markdown documents using fenced blocks:

    ```plantuml
    Bob -> Sara : Hello
    Sara -> Bob : Go away
    ```

Closes: #4048

Don't execute git hooks if you create branch as part of other change

Closes #23439

See merge request !7237

Backport frontend test fixes from webpack branch

See merge request !8945

Ignore node_modules in rubocop

See merge request !8942

Don't require lib/gitlab/request_profiler/middleware.rb in config/initializers/request_profiler.rb

Closes #20452

See merge request !8927

Resolve "Comment button doesn't align vertically with line number"

Closes #26859

See merge request !8918

Resolve "Comment button doesn't align vertically with line number"

Closes #26859

See merge request !8918

Fix Ruby verification command

See merge request !8938

Resolve "Double separator line in Edit projects settings"

Closes #27321

See merge request !8917

Simplify the SSH protocol introduction and link to a DO tutorial

See merge request !8901