Part 1 of 4.

Sets the groundwork for the “Highlight paid features during active trial”
experiment. Mainly, it sets up a new experiment using the `gitlab-experiment`
gem (GLEX) and creates the initial badge component that will be used as the
building block for the rest of the experiment features.

Change duplicate description in the glossary

See merge request gitlab-org/gitlab!59054

Update external users permissions docs

See merge request gitlab-org/gitlab!59302

Default enable cascading settings feature flag

See merge request gitlab-org/gitlab!59026

Schedule artifact expiry backfill again

See merge request gitlab-org/gitlab!59270

The previous background migration left around 400.000 artifacts without
an expiry date. This schedules the background migration again to
backfill those entries as well.

Redirect monthly docs release process to handbook

See merge request gitlab-org/gitlab!59094

Fix docs usage of master branch in Plan docs

See merge request gitlab-org/gitlab!59269

Revert !58833 [RUN AS-IF-FOSS]

See merge request gitlab-org/gitlab!59293

Docs: Add three Praefect metrics (gitaly_praefect_replication_latency_bucket, gitaly_praefect_replication_delay_bucket and gitaly_praefect_node_latency_bucket) to the docs

See merge request gitlab-org/gitlab!59064

Docs: Add three Praefect metrics (gitaly_praefect_replication_latency_bucket, gitaly_praefect_replication_delay_bucket and gitaly_praefect_node_latency_bucket) to the docs

Fix Sourcegraph with MR diffs

See merge request gitlab-org/gitlab!58746

Update dependency webpack-bundle-analyzer to ^4.4.1

See merge request gitlab-org/gitlab!59248

Add intro issue to Group OAuth app doc

See merge request gitlab-org/gitlab!59296

Externalize strings in app/views/devise/passwords/new.html.haml

See merge request gitlab-org/gitlab!58236

Add "issues created" action to continuous onboarding design

See merge request gitlab-org/gitlab!58690

Very first changes for loading JH extension

See merge request gitlab-org/gitlab!58886

Remove dashboard settings component and use project manager instead

See merge request gitlab-org/gitlab!58477

Removes an unnecessary component and moves the logic it was
handling into a more appropriate component.

This reverts merge request !58833

Support filtering by assignee wildcard in GraphQL

See merge request gitlab-org/gitlab!58996

Bump rspec-rails to 5.0.1

See merge request gitlab-org/gitlab!59194

Move updating older-statuses-retried before enqueueing

See merge request gitlab-org/gitlab!59034

Refactor(Purchase Flow): use added `gl-*`-styles

See merge request gitlab-org/gitlab!59013

Allow to update epic board lists

See merge request gitlab-org/gitlab!58811

Add docs for failover with Geo Helm Charts

See merge request gitlab-org/gitlab!58077

Add warning for Geo internal URL OAuth in the docs

See merge request gitlab-org/gitlab!59244

Fix updating value stream record without stages

See merge request gitlab-org/gitlab!59176

Pipeline Graph: Update Conditions for Showing Switcher

See merge request gitlab-org/gitlab!59174