GraphQL does not have inheritance, so it is an anti-pattern to use
it to model polymorphism in our models.

The correct approach is to model polymorphism as implementation of
interfaces. Here there is a single `PackageType` interface, and
then different implementations of that.

Since the package types only differ in their metadata, we move the
polymorphism down to the metadata fields, which an empty interface,
implemented by metadata types.

One thing that had to change was the `Query.package` field,
which was previously `Query.package_composer_details`. This must change
since the implementation of the lookup does not perform any type
checking, and thus we cannot type the return value as a composer
package. This would be an illegal and ill-typed down-cast. A good
analogy for this is having a Java collection of

```java
// yes, Cucumbers are fruits - look it up
List<Fruit> bowl = List.of(new Apple(), new Banana(), new Cucumber())
```

And then expecting to get an apple without a cast:

```java
Apple fruit = bowl.get(0) // bad
```

This code would fail to compile in Java, and it is equally illegal
in GraphQL, without the appropriate casting.

We mark the composer metadata type as an orphan since it is only refered
to as an implementation of the broader metadata type.

We also split the type of packages into a top-level one, which is able
to refer to versions, and a leaf node which may not. This prevents
unbounded mutual cyclic recursion.

Return successfully for all packages

We can gradually add more specific package types, but it is important
to always succeed with the data we can return.

Fix border bottom color collapsed replies

See merge request gitlab-org/gitlab!51871

Merge branch '299462-create-issue-from-vulnerability-details-edited-text-is-discarded' into 'master'

Do not overwrite fields that are populated

See merge request gitlab-org/gitlab!52376

Add attributions for repository push flag definition

See merge request gitlab-org/gitlab!52399

This adds MR, issue, milestone and group details to the definition for
the repository_push_audit_event feature flag.

Update Gitaly version

See merge request gitlab-org/gitlab!53027

Add the Manage::Import total GMAU metric

See merge request gitlab-org/gitlab!51496

Add click tracking to in product marketing email campaigns

See merge request gitlab-org/gitlab!52723

Use mock-apollo-provider in SAST UI tests

See merge request gitlab-org/gitlab!52897

Using mock-apollo-provider results in a more realistic test, since the
internals of the component(s) (i.e., `data`) aren't manipulated by the
test suite.

This change also removed an unnecessary use of `localVue` in a related
test suite, and moved the SAST spec helpers up a level in the tree.

Addresses https://gitlab.com/gitlab-org/gitlab/-/issues/249556.

Update snapshot worker arguments

See merge request gitlab-org/gitlab!52785

Make LifecycleEvents exceptions to be fatal

See merge request gitlab-org/gitlab!52881

Monitor RackAttack redis usage and enrich auth structured logs

See merge request gitlab-org/gitlab!52471

Oncall-Rotations: Persist shifts job

See merge request gitlab-org/gitlab!50239

- Queue files and barebone jobs

Delete old redirect files in doc/ci, install, ops, telemetry

See merge request gitlab-org/gitlab!52993

These redirect files have expired and we
no longer need to maintain them. Server-side
redirects will remain in the gitlab-docs project

Enable specialized_project_authorization_worker feature flag

See merge request gitlab-org/gitlab!52719

Merge branch '300520-foss-test-failure-feature_available-expected-2-arguments-but-given-1' into 'master'

Resolve "FOSS test failure - feature_available? expected 2 arguments but given 1" [RUN AS-IF-FOSS]

See merge request gitlab-org/gitlab!53003

Improve highlighting for merge diffs

See merge request gitlab-org/gitlab!52499

Process one record at a time in Bulk Import pipelines

See merge request gitlab-org/gitlab!52330

Update reduce repo size documentation

See merge request gitlab-org/gitlab!52734

Merge branch 'mwaw/273391-extract-product-analytics-metrics-aggregation-out-of-hllrediscounter-module' into 'master'

Extract Product Analytics metrics aggregation out of HLLRedisCounter module

See merge request gitlab-org/gitlab!52334

Update gitlab-experiment to version 0.4.8 [RUN ALL RSPEC]

See merge request gitlab-org/gitlab!52824

Do not interpret escaped markdown as shortcuts (like `@` and `#`)

See merge request gitlab-org/gitlab!45922

so they don’t get confused as references

Expose if user is a bot

See merge request gitlab-org/gitlab!52003

Add OpenSearch for GitLab

See merge request gitlab-org/gitlab!52583

Introduce a rendering limit for commit titles

See merge request gitlab-org/gitlab!52904

Merge branch '223618-project-labels-api-return-404-label-not-found-if-label-name-contains-dot' into 'master'

Project labels API returns error if label name contains dot "."

See merge request gitlab-org/gitlab!52591