When an issue, MR, or epic contains a lot of user references (even to
the same user), we use the method
Banzai::ReferenceParser::BaseParser.collection_objects_for_ids to load
those users and maintain the loaded users for the current request in a
RequestStore cache.

This method calls Hash#values_at with the splatted IDs - so one argument
per ID passed in. If enough IDs are passed in, it's possible for the
arguments here to overflow the stack.

Let's say we have:

    ids = [1] * 1_000_000; ids.length
    #=> 1000000
    cache = {}
    #=> {}
    cache.values_at(*ids).compact
    # SystemStackError: stack level too deep

We could do this `cache.values_at(*ids.uniq).compact`, but that would
fail in this case:

    distinct_ids = 1.upto(1_000_000).to_a; distinct_ids.length
    #=> 1000000
    cache.values_at(*distinct_ids.uniq).compact
    # SystemStackError: stack level too deep

So the best option seems to be to just write a slower, but
non-stack-consuming, version:

    Benchmark.realtime { ids.uniq.map { |id| cache[id] }.compact }
    #=> 0.15192799968644977
    Benchmark.realtime { distinct_ids.uniq.map { |id| cache[id] }.compact }
    #=> 0.3621319998055696

To test this locally, you can replace the last issue's description with
a lot of mentions of a user (here I've created a user with the username
't'), but it takes a long time:

    problem = ('@t ' * 1_000_000)[0...1_000_000]; problem.length
    #=> 1000000
    Issue.last.update!(description: problem_string)

Visiting that issue in the UI will then overflow the stack. With this
change, it won't (although it is very slow).

Pass through TOP_UPSTREAM_SOURCE_REF for qa pipeline

See merge request gitlab-org/gitlab!22263

Fix shallowMount + stubs behavior change in `@vue/test-utils`

Closes #145615

See merge request gitlab-org/gitlab!22286

Provide proper mock data for test

Closes #191453

See merge request gitlab-org/gitlab!22316

Replace trigger with emit in test

Closes #191430

See merge request gitlab-org/gitlab!22315

Test for no offenses only makes sense with offense

See merge request gitlab-org/gitlab!22301

Add ajax wait for requests

Closes #55286

See merge request gitlab-org/gitlab!22291

Stop exposing MR refs in favor of persistent pipeline refs

Closes #35918 and #35140

See merge request gitlab-org/gitlab!22198

Add weight change tracking

See merge request gitlab-org/gitlab!21515

This commit fixes the inconsistent behavior of MR refs

Resolve "Users in Personal trials should be able to upgrade"

See merge request gitlab-org/gitlab!22270

Add nextTick to setData calls for Jest tests

Closes #38108

See merge request gitlab-org/gitlab!22232

Fix karma tests in future version of VTU

See merge request gitlab-org/gitlab!22358

Always invoke find on updated Vue tree

Closes #181842

See merge request gitlab-org/gitlab!22288

Wrap trigger into nextTick calls

Closes #192019

See merge request gitlab-org/gitlab!22324

Remove spinner when approval require input is changed

Closes #38090

See merge request gitlab-org/gitlab!22186

Documentation for pages size Limitations by Project or Group

See merge request gitlab-org/gitlab!22334

Write system note if weight tracking feature
flag is not set

Make comment more generic

Fix scope for SystemNoteMetadata constructor
call

and add specs

Add specs and fix missing include on ResourceWeightEvent

Fix schema.rb on_delete clause

Add specs for note count by feature flag

Add specs for services

Cut and paste Markdown table from a spreadsheet

Closes #27205

See merge request gitlab-org/gitlab!22290

Wait for axios mock in spec

Closes #122859

See merge request gitlab-org/gitlab!22285

Update spec to properly wait for promise to resolve

Upon pasting to a Markdown input, this commit will try to detect whether
a spreadsheet has been copied to the clipboard and automatically create
a Markdown table.

This is based off code from
https://github.com/jonmagic/copy-excel-paste-markdown.

Closes https://gitlab.com/gitlab-org/gitlab/issues/27205

Add option to configure branches for which emails should be sent on push

See merge request gitlab-org/gitlab!22196

Fix trigger calls

Signed-off-by: Balasankar "Balu" C <balasankarc@autistici.org>

Fixes failing tests in @vue/test-utils 1.0.0-beta.30

Ensure nextTick is called after setProps

Closes #38110

See merge request gitlab-org/gitlab!22319

Update dependency @gitlab/ui to v8.10.0

See merge request gitlab-org/gitlab!22350

Fix breakpoint size in awards handler

See merge request gitlab-org/gitlab!22159

Signed-off-by: Balasankar "Balu" C <balasankarc@autistici.org>

Signed-off-by: Balasankar "Balu" C <balasankarc@autistici.org>

Publish the feature - Limit pipeline job concurrency using named semaphores

Closes #15536

See merge request gitlab-org/gitlab!21617

This commit adds docs for Ci resource group

Also add it to multiple page base class methods

We are adding weich change tracking events similarly to label events
and in order to keep consistent and not duplicate system notes
we are generating the notes out of tracked weight change events.

Create FKs to issues and users as part of `references`
Use bulk insert in weight events tracking

Revert schema changes

Apply schema changes

Add feature flag test

Add foreign keys

Remove explicit key removal

Correcting use of "specially" to "especially."

See merge request gitlab-org/gitlab!22349