And: reduce all the possible state combinations to a FSM

Per design review, this component needed a bunch more
interactivity. Most critically, around displaying and responding
to a load error.

Rather than set a bunch of flags and toggle various elements
based on a collection of booleans, I think it's much easier to
reason about this component if it has a Finite State Machine
representing its possible states and transitions between them.

The two notable logic additions here are a rudimentary FSM
(`transition`) and a state checker (`is`).

`transition` defines all the ways the component can go from
one state to another. If a transition is attempted that doesn't
match one of these declared transitions, it does nothing.
Every transition always results in a declared state.
these two things combined make it much easier to reason
about what the component should look like at any given
moment.

Other than the state machine (which should be replaced with
something like @xstate/fsm), the rest of these changes are
text changes from UX/technical writing review.

Also updates other components that eventually
use the same component

Per our design docs, global flash messages aren't appropriate
in this context (or virtually anywhere!), so there's no reason
to catch this error here.

Change codeblock fence languages to full name 2

See merge request gitlab-org/gitlab!32502

Lighten card divider within epic tree cards

Closes #217869

See merge request gitlab-org/gitlab!32273

Network policy management endpoints

See merge request gitlab-org/gitlab!30911

Update GitLab Pages Documentation

See merge request gitlab-org/gitlab!32283

Update documentation for GitLab Pages administration to include
a section about using API-based configuration.
Includes steps to disable this feature introduced via this [Pages MR](
https://gitlab.com/gitlab-org/gitlab-pages/-/merge_requests/264)
and [Omnibus MR]
(https://gitlab.com/gitlab-org/omnibus-gitlab/-/merge_requests/4057)

Add sync secrets section to pages admin

Renamed configure to enable on security config page

See merge request gitlab-org/gitlab!31503

Fixed redirection to project snippets

See merge request gitlab-org/gitlab!32530

When deleting a Project snippet, we should redirect to the project
snippets, not hte project itself

Make CSS gray variables more consistent with Pajamas and gitlab-ui

Add FF removed note to Roadmap

See merge request gitlab-org/gitlab!32454

Merge branch '22691-externalize-i18n-strings-from-./app/views/shared/milestones/_merge_requests_tab.haml' into 'master'

Externalize i18n strings from ./app/views/shared/milestones/_merge_requests_tab.haml

See merge request gitlab-org/gitlab!32158

https://gitlab.com/gitlab-org/gitlab/-/merge_requests/32158

Improve the suggest pipeline popover content alignment

Closes #217634

See merge request gitlab-org/gitlab!32453

- was misaligned before and this fixes that.

Add a feature flag to disable deduplication

See merge request gitlab-org/gitlab!32469

Migrate javascripts/pages specs to Jest

Closes #194246

See merge request gitlab-org/gitlab!32506

Resolve "Embedded snippets numbering and scrolling is off"

Closes #207934

See merge request gitlab-org/gitlab!32411

Migrate spec/javascripts/prometheus_metrics/ to Jest

Closes #194252

See merge request gitlab-org/gitlab!32509

License Compliance - Add documentation for Yarn registries

See merge request gitlab-org/gitlab!32179

Record connection pool metrics

See merge request gitlab-org/gitlab!31476

Add a sampler for the `#stat` method of a connection pool, and record
those stats in Prometheus. This applies to all stats except
`checkout_timeout`, which is really more of a configuration item. It
also applies to all database connections we use: the main one, the Geo
tracking database, and any connection pools for database load balancing
hosts.

This requires a fix to Geo::TrackingBase.connected?, which wasn't
correctly reporting the connection's status.

Add alert counts by status to graphql

See merge request gitlab-org/gitlab!31818

Adds support for a alert_management_alert_status_count query
to GraphQL project. This includes counts for each status of
alert for the query, as well as counts for a categories 'all'
and 'open' which includes both triggered and acknowledged events.

Fix leaky constant in factory spec

See merge request gitlab-org/gitlab!32099

Correct the permission according to docs

See merge request gitlab-org/gitlab!28657

Try to Stablize Export file download spec in staging

See merge request gitlab-org/gitlab!32305

Fix leaky constant in master check, attr config, issue connection specs

See merge request gitlab-org/gitlab!32144

Validate package types in package metadatum models

See merge request gitlab-org/gitlab!32091

Applied from patch by @10io