Issue Template for implementation issues

Closes gitlab-org/threat-management/general#737

See merge request gitlab-org/gitlab!42427

Expose namespace_per_environment flag for Kubernetes clusters

See merge request gitlab-org/gitlab!42309

Add BulkImportsController for user to provide credentials

See merge request gitlab-org/gitlab!42704

Fix kwargs deprecation warnings

See merge request gitlab-org/gitlab!43543

Remove feature flag

See merge request gitlab-org/gitlab!43200

Fix ruby 2.7 deprecation warnings in namespaces_helper.rb

See merge request gitlab-org/gitlab!43601

Docs: Aggregate AppSec troubleshooting

See merge request gitlab-org/gitlab!42486

Support is seeing many tickets about these errors and warnings.
This adds basic advice about where to find more specific messages
and how to enable logging to find even more details.

The idea behind updating both `application_security/index.md` and
`job_artifacts.md` with almost similar advice is that the latter
is probably the "last resort".

More details and review discussion:
https://gitlab.com/gitlab-org/gitlab/merge_requests/42486

Update .gitlab/CODEOWNERS

See merge request gitlab-org/gitlab!43647

Fix group for group import ndjson feature flags

See merge request gitlab-org/gitlab!43715

Separate trainee maintainer and reviewer in reviewer roulette

Closes #258545

See merge request gitlab-org/gitlab!43656

Merge branch '255878-review-app-existing-poddisruptionbudget-on-review-master2-ho-bqf4ik' into 'master'

Handle non-existent helm release during cleanup

Closes #255878

See merge request gitlab-org/gitlab!43515

Include assigned users in /reassign autocomplete

See merge request gitlab-org/gitlab!43383

Update FF definitions by Shinya Maeda

See merge request gitlab-org/gitlab!43537

Move lengthy data attributes from view into helper

See merge request gitlab-org/gitlab!40671

Adds a new helper method, data_attributes_for_progress_bar, and tests it
Removes the onboarding_issues_experiment_enabled variable from the view

Fix list spacing

See merge request gitlab-org/gitlab!43652

Config to hide Open/Closed list in Boards

See merge request gitlab-org/gitlab!42945

Remove the `container_registry_fast_tag_delete` feature flag

See merge request gitlab-org/gitlab!43555

Parse build trace checksum provided in hexadecimal

Closes #258636

See merge request gitlab-org/gitlab!43718

Fix Ruby 2.7 deprecation warnings for RefreshService

See merge request gitlab-org/gitlab!43675

Fix sentence splitting in Gitpod message

Closes #248442

See merge request gitlab-org/gitlab!43313

Remove `ci_update_queues_for_online_runners` ff

See merge request gitlab-org/gitlab!43553

Resolve "Allow self-managed to deactivate users after 90 days"

Closes #201769

See merge request gitlab-org/gitlab!42989

Update dependency @gitlab/ui to v21.9.0

See merge request gitlab-org/gitlab!43704

Use backend filtering to autocomplete vulnerabilities

See merge request gitlab-org/gitlab!42946

Remove `ci_bulk_insert_on_create` feature flag

See merge request gitlab-org/gitlab!43548

Hard wrap lines, and perform some smaller changes. Done in a
separate commit to make rebasing / merging easier.

Adds the ability to use a namespace per project, instead of namespace
per environment, for deployments using GitLab's Kubernetes integration.

See https://gitlab.com/gitlab-org/gitlab/-/issues/38054

- In order to add Group Import V2 using API first step
  is to add an ability for user to provide auth credentials
  for GitLab to use in order to authenticate with source GitLab
  later on

Add ability to sort vulnerabilities by report type

See merge request gitlab-org/gitlab!42979

This change adds ability to sort vulnerabilities by report type in
GraphQL.

Ensure JobWaiter keys always expire

See merge request gitlab-org/gitlab!43320

GitLab Runner sends build trace CRC32 checksum in a hexadecimal format.
This commit converts hexadecimal number to decimal to make it possible
to verfiy checksum.

Remove banner that suggests WedIDE gitlab-ci.yml

Closes #248564

See merge request gitlab-org/gitlab!42815

Add index to ci_builds to optimize UsageData usage_activity_by_stage

See merge request gitlab-org/gitlab!37581