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

Add merge train helper text to merge request widget

Closes #11982

See merge request gitlab-org/gitlab-ee!14097

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

65483 add a resend confirmation link EE

See merge request gitlab-org/gitlab-ee!15162

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

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.

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.

Support multiple sites in DAST reports

See merge request gitlab-org/gitlab-ee!14787