Add Invite Members modal behind feature flag

See merge request gitlab-org/gitlab!37906

- behind feature flag :invite_members_group_modal
- no User dropdown search yet, that will be added next
- the trigger link in the side nav is behind the same feature flag

Fix Ruby 2.7 deprecation warnings in snippet_repository_spec.rb

See merge request gitlab-org/gitlab!43516

Docs: how to perform your own backups on com.md

See merge request gitlab-org/gitlab!41788

Remove PG warning with with_lock_retries

See merge request gitlab-org/gitlab!43292

Send only one scope query when requesting pipeline findings

See merge request gitlab-org/gitlab!43535

Make git lfs for push mirrors work to GitHub.com

Closes #250654

See merge request gitlab-org/gitlab!43321

There are two changes required:

* Add an Accept: application/vnd.git-lfs+json header to batch requests
* Support the verify action

Without the former, GitHub (but not GitLab) responds with a 406 HTTP
response to the batch request. With it, GitHub responds with a spec
indicating that `verify` should be used.

Merge branch '251048-modify-time-period-for-batch-counting-performance-of-the-last-portion-of-the-loops' into 'master'

Improve batch counting performance for last 28 days

See merge request gitlab-org/gitlab!42972

Delete the .netrc file created during a QA test

See merge request gitlab-org/gitlab!43233

Disable (skip) the Auto DevOps QA test

See merge request gitlab-org/gitlab!42650

Add information about pull_mirror_branch_prefix FF

See merge request gitlab-org/gitlab!43530

Speed up pipeline seed build spec

See merge request gitlab-org/gitlab!43478

Speed up cycle analytics events specs

See merge request gitlab-org/gitlab!43291

Update documentation and images for the security dashboard

See merge request gitlab-org/gitlab!43454

Fix Ruby 2.7 deprecation warnings in several snippet classes

See merge request gitlab-org/gitlab!43520

Aims is to improve batch counting performance

Docs: Add metadata to install pages

See merge request gitlab-org/gitlab!43415

Fix Ruby 2.7 deprecation warnings routing helpers specs

See merge request gitlab-org/gitlab!43528

Fix Ruby 2.7 deprecation warnings in UsageData

See merge request gitlab-org/gitlab!43526

Migration of Serverless Section "Install Prometheus" Button

Closes #219761

See merge request gitlab-org/gitlab!43456

Update group on increased_diff_limits feature flag

See merge request gitlab-org/gitlab!43413

Add details about `limit_projects_in_groups_api` feature flag

See merge request gitlab-org/gitlab!43506

Fix Ruby 2.7 deprecation warnings in snippet_input_action_spec.rb

See merge request gitlab-org/gitlab!43523

Give details about three feature flags of group::analytics

See merge request gitlab-org/gitlab!43401

Update sql_set_operators FF YAML

See merge request gitlab-org/gitlab!43230

Docs: Revamp Composer topic

See merge request gitlab-org/gitlab!42764

Related to: https://gitlab.com/gitlab-org/gitlab/-/issues/247950

Fix button placement on pipeline graph

See merge request gitlab-org/gitlab!43419

Add documentation for upgrading PostgreSQL in a Patroni cluster

See merge request gitlab-org/gitlab!41732

Fix Ruby 2.7 deprecation warnings in app/controllers/import

See merge request gitlab-org/gitlab!43494