CE backport for gitlab-org/gitlab-ee!14097: Add merge train helper text to merge request widget

See merge request gitlab-org/gitlab-ce!30686

Update text: Cycle -> Productivity

See merge request gitlab-org/gitlab-ce!31830

Changes to cycle analytics docs

See merge request gitlab-org/gitlab-ce!31572

Add missing (FREE ONLY) docs tier badge

See merge request gitlab-org/gitlab-ce!31755

Note that assigning many people is starter feature

See merge request gitlab-org/gitlab-ce!30700

Update Mattermost System Console settings page URL for webhooks

See merge request gitlab-org/gitlab-ce!31334

Add docs page for productivity_analytics

See merge request gitlab-org/gitlab-ce!31460

Make ruby 2.6 the officially supported version

See merge request gitlab-org/gitlab-ce!31675

Merge branch '64950-move-download-csv-button-functionality-in-metrics-dashboard-cards-into-the-dropdown' into 'master'

Move download CSV functionality to dropdown in metrics

Closes #64950

See merge request gitlab-org/gitlab-ce!31679

This MR adds the functionality to download metrics data
as CSV. It also removes the exportMetricsToCsvEnabled feature
flag which was used before the dropdown was implemented to
display a button.

Open source alternative to reCAPTCHA for GitLab.com registration

See merge request gitlab-org/gitlab-ce!31625

Add a resend confirmation link when grace period is expired

See merge request gitlab-org/gitlab-ce!31476

This link is shown when a user tries to login with an unconfirmed
email address and the grace period has expired

This commit adds a helper text that describes what will happen when a
user clicks the "Start/Add to merge train when pipeline succeeds"
button.  This text appears at the bottom of the merge request widget.

In addition, this commit renames the "merge_train_info" component to
"merge_train_position_indicator" to avoid ambiguity with the
"merge_train_helper_text" component.

Changed selection classes to harmonize with other settings

Closes #62286

See merge request gitlab-org/gitlab-ce!31110

Migrate remaining users with null private_profile

See merge request gitlab-org/gitlab-ce!31708

Resolve "Follow-up from !30458: create `kubectl_delete(args)`"

See merge request gitlab-org/gitlab-ce!31353

- refactor Knative and Prometheus

Migrates Snowplow backend implementation from EE to CE

See merge request gitlab-org/gitlab-ce!31199

This introduces several changes, but these are all just ported from the
EE project.

Fixed border styles for callout

Closes #66000

See merge request gitlab-org/gitlab-ce!31782

Revert "Merge branch '64341-data-and-privacy-agreement-for-gitlab-users' into 'master'"

See merge request gitlab-org/gitlab-ce!31817

This reverts merge request !30808

Track views of cycle analytics show page

See merge request gitlab-org/gitlab-ce!31717

This change adds a new counter 'cycle_analytics_views' to the usage data
metrics to count the page views for cycle analytics show page.

Fix the style-lint errors and warnings for wiki.scss

Closes #59829

See merge request gitlab-org/gitlab-ce!31656

There were two errors: duplicate styles and @extend used with a class
name. I added `.top-area` class to all the instances where
`.wiki-page-header` is used since %top-area didn't really make a lot of
sense as a placeholder selector. This is also consistent with behaviour
on other pages where the `.top-area` class is used alongside the other
classes for the specific header styling.

Add `ci_dag_limit_needs`

See merge request gitlab-org/gitlab-ce!31803

Docs add guest user clarification

See merge request gitlab-org/gitlab-ce!31805

Reduce Gitaly calls in PostReceive

Closes #65878

See merge request gitlab-org/gitlab-ce!31741