Add new API endpoint to expose single environment

Closes #30157

See merge request gitlab-org/gitlab-ce!26887

This is resolving https://gitlab.com/gitlab-org/gitlab-ce/issues/30157.

Implement new API endpoint `/projects/:id/environments/:environment_id`
to expose single environment. Include information for environment's last
deployment if there is one.

Enable ESLint rule jest/no-jasmine-globals

See merge request gitlab-org/gitlab-ce!27137

CE backport: Move EE differences for `app/views/admin/users/show.html.haml`

Closes gitlab-ee#6099

See merge request gitlab-org/gitlab-ce!26874

Adds a vendors folder for third party CSS

Closes #59694 and #59708

See merge request gitlab-org/gitlab-ce!27119

Does not run stylelint for the vendors folder

Fixed EE differences in note_body.vue

Closes gitlab-ee#9968

See merge request gitlab-org/gitlab-ce!27126

Remove EE-specific changes from FilteredSearchBoards (CE-backport)

See merge request gitlab-org/gitlab-ce!27122

Revert "Merge branch 'fix-ide-web-worker-relative-url' into 'master'"

Closes #60217

See merge request gitlab-org/gitlab-ce!26066

Set Release Name When Adding Release Notes to an Existing Tag

Closes #58418

See merge request gitlab-org/gitlab-ce!26807

Also set the release sha and author

This reverts merge request !26015

Name GitLab managed apps

See merge request gitlab-org/gitlab-ce!27129

QA: Change CI value to something that can be masked

See merge request gitlab-org/gitlab-ce!27146

Docs: Update predefined_variables.md to fix anchor

See merge request gitlab-org/gitlab-ce!27127

Update Okta configuration notes

See merge request gitlab-org/gitlab-ce!27076

Fix default_project_creation already exists

See merge request gitlab-org/gitlab-ce!27144

For those who upgraded to a version that included the previous
backport implementation with migration 20190311132500.

The current value cannot be masked[1] but CI variables default to
masked. Rather than implementing a toggle for the masking control,
simply change the value to something that can be masked.

[1] Currently, "simple" values can be masked:
* it should be a single line
* it should not have escape characters
* it should not use variables
* it should not have any whitespace
* it should be longer than 8 characters

https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/25476

Backport `add_default_project_creation_setting` to CE

See merge request gitlab-org/gitlab-ce!27141

Fix stage index migration failing in PostgreSQL 10

Closes #59985

See merge request gitlab-org/gitlab-ce!26972

Refactor Issues doc

Closes #56877

See merge request gitlab-org/gitlab-ce!24695

Document IS_GITLAB_EE environment variable

Closes #60131

See merge request gitlab-org/gitlab-ce!27120

Enable ESLint rule jest/no-focused-tests

See merge request gitlab-org/gitlab-ce!27132

Override problematic display with utility class

Closes #60231

See merge request gitlab-org/gitlab-ce!27138

GraphQL complexity limit too low for Schema load / IntrospectionQuery

Closes #60123

See merge request gitlab-org/gitlab-ce!27063

CE: Extract EE specific files/lines for Discussion spec/services

See merge request gitlab-org/gitlab-ce!26950

Edits to documentation dev doc index

See merge request gitlab-org/gitlab-ce!27135

An IntrospectionQuery required more
complexity points.