Introduced empty/error UX states to environments monitoring.

Closes #29212

See merge request !10271

Github import rake task

See merge request !10308

Search for opened MRs - include reopened  MRs

Closes #30291

See merge request !10407

Wait for the PDF to be loaded before doing anything

Closes #30531

See merge request !10493

Fix html structure to prevent tooltip from not hidding

Closes #30493

See merge request !10474

Periodically mark projects that are stuck in importing as failed

Closes #17709

See merge request !10207

Add remove_concurrent_index to database helper

Closes #30376

See merge request !10441

Show CI status as Favicon on Pipelines, Job and MR pages

Closes #12818

See merge request !10144

ProjectsFinder should handle more options

Closes #28810

See merge request !9682

Enable creation of deploy keys with write access via the API

Closes #30021

See merge request !10488

STL file viewer

See merge request !10368

Closes #30531

Clearly show who triggered the pipeline in pipeline successful/failed email

Closes #28755

See merge request !10283

Extended ProjectFinder in order to handle the following options:
 - current_user - which user use
 - project_ids_relation: int[] - project ids to use
 - params:
   -  trending: boolean
   -  non_public: boolean
   -  starred: boolean
   -  sort: string
   -  visibility_level: int
   -  tags: string[]
   -  personal: boolean
   -  search: string
   -  non_archived: boolean

GroupProjectsFinder now inherits from ProjectsFinder.
Changed the code in order to use the new available options.

Show who triggered the pipeline. And also show the commit committer if
it's different from the author.

Visit `/rails/mailers/notify` on your local running GitLab instance to
show a preview pipeline success emails.

Fix for open redirect vuln involving continue[to] params

See merge request !2083

Fix for three open redirect vulns using redirect_to url_for(params.merge)))

See merge request !2082

Fix for path disclosure in project import/export

See merge request !2080

Don’t show source project name when user does not have access

See merge request !2081

Remove class from SanitizationFilter whitelist

See merge request !2079

Issue title realtime

Closes #25051

See merge request !10115

[ci skip]

[ci skip]

[ci skip]

Deal with Rails autoload instance variable resets

See merge request !10338

Disable pipeline & environment actions that are not playable

Closes #25385 and #24601

See merge request !10052

Refactor CI index page

Closes #29217

See merge request !9861

Add "search" optional param and docs for V4

Closes #30195

See merge request !10358

Workhorse 1.4.3

Closes gitaly#167 and gitaly#177

See merge request !10479