It was named as $emojiBtn before I was using $emojiButton so updated them to be consistent.

Fix rubocop offense in awardable specs

Fixes failing tests on master.

See merge request !4481

Enable Lint/AmbiguousOperator rubocop cop

Enforce using parentheses if ambiguous operators are detected, like `header *some_method` or `array.select &:even?`.

See #17478

See merge request !4454

[ci skip]

Document the API endpoint for gathering a build log

## What does this MR do?

Adds documentation for gathering a trace build log via the API. Documenting the following:
https://gitlab.com/gitlab-org/gitlab-ce/blob/de20bd5b31715f096db3fb0155c82b0eea992b6c/lib/api/builds.rb#L98-110

## Are there points in the code the reviewer needs to double check?

Please verify that a curl request using the same format as documented works

## Why was this MR needed?

No documentation currently exists

## What are the relevant issue numbers?

#18015 

## Screenshots (if relevant)

See merge request !4467

Fix link to current design reference in the CONTRIBUTING guide

## What does this MR do?

It fixes an outdated link by replacing it with the up-to-date one.

See merge request !4439

Allow bulk-assign labels to issues

- [x] Allow bulk-assignment labels.
- [x] Show indeterminate state for labels present on selection.
- [x] Remove existing labels from selected items if label gets unmarked.
- [x] Fix conflicting tests.
- [x] Write tests.

Closes #13499 and #15489

See merge request !3917

Instead of passing `remove_label_ids`, just pass an empty array for
`label_ids` (and don't pass `add_label_ids` or `remove_label_ids`).