Documentation for multiple value streams

Closes #221204

See merge request gitlab-org/gitlab!39299

Adds changelog entry

Enables the value_stream_analytics_create_multiple_value_streams
feature flag

Fix userNotesCount aggregate

See merge request gitlab-org/gitlab!38871

This change fixes problem where 2 aggregates were using same key to
store its state. This change also renames lazy_aggregate to more
specific name to prevent similar situation to occur in the future.

Remove fa-sign-out styles

See merge request gitlab-org/gitlab!39335

Merge branch '218084-merge-widget-gives-ambiguous-ui-instructions-when-merge-trains-are-enabled' into 'master'

MR widget instructions are unclear when merge trains are enabled

Closes #218084

See merge request gitlab-org/gitlab!38619

We update the merge train helper text
and we move it right under the button for
more clarity. This mean we had to move
the helper text component from the mr-widget-options
to the ready-to-merge component and update the
tests accordingly.

Enable FF about CI Lint dry run mode

See merge request gitlab-org/gitlab!39350

Remove feature flag metrics_dashboard_new_panel_page

See merge request gitlab-org/gitlab!39124

Enable squash option feature by default

See merge request gitlab-org/gitlab!39382

Refactor http spec helpers

See merge request gitlab-org/gitlab!39321

Speed up member model specs

See merge request gitlab-org/gitlab!39387

Skip subsequent topology Prometheus queries if timeout occur

See merge request gitlab-org/gitlab!38293

Verification of usage ping metrics

See merge request gitlab-org/gitlab!39356

This commit removes the metricsDashboardNewPanelPage feature flag
from the frontend so the button is displayed to all users.

Now that the new panel page on the frontend is ready, we can remove
the feature flag.

Document unit test guidelines for EE features

See merge request gitlab-org/gitlab!39309

Remove transition animation from the Container Registry UI

See merge request gitlab-org/gitlab!39337

Fix flaky todo finder spec

Closes #235932

See merge request gitlab-org/gitlab!39425

Prepare tag_field_new_spec for Jest 26

See merge request gitlab-org/gitlab!39426

Add docs for Redis HLL counters

Closes #235457

See merge request gitlab-org/gitlab!39298

Add visual error handling to MR analytics Throughput chart

See merge request gitlab-org/gitlab!39196

We must pass a type when filtering by target_id because it could
match other models having the same ID

Remove refresh button css in environments

Closes #208205

See merge request gitlab-org/gitlab!39305

Add extra troubleshooting steps when promoting a Geo secondary

See merge request gitlab-org/gitlab!39274

Disable loading hasNextPage value for Security Dashboards

See merge request gitlab-org/gitlab!39261

This change disables loading hasNextPage for Vulnerabilities as this is
causing Internal Server Error caused by timeouts on database. This is
the temporary solution to solve that problem.

Swimlanes - Fetch issues using GraphQL endpoint

See merge request gitlab-org/gitlab!39054

Add runbook to metric dropdown

See merge request gitlab-org/gitlab!39288

Remove mentions of CC from version notes

See merge request gitlab-org/gitlab!39326

Move duplicated code from package helpers
to the more general http helper.

- Fetch issues for all board lists though VueX action

Doc update - alert runbooks

See merge request gitlab-org/gitlab!38661