Add an extra layer of security by checking a development token
to prevent users from starting using WIP feature
on private GitLab instances.

Use `DateTime.parse` to support dates of various formats

When the user of the endpoint didn't pass `start_time`,
then the parser will set it to the current time in RFC3339 format.

The parser looks for the list of fields to paste them
in an issue's summary:

* start_time
* description
* monitoring_tool
* service
* hosts

If any of the fields are not present, they will be excluded.

If the title field is missing
the parser will set the field to the default value.

As a prototype, the parser will turn initial payload into a Prometheus
specific format.
That helps us reuse the existing implementation of creating issues based
on Prometheus alerts.
Follow up changes will extend the parser to more fields.

Extract incident processing shared examples from Notify services

Create a duplicated but simplified version of the
`Projects::Prometheus::Alerts::NotifyService`.
The service still uses a Prometheus payload structure.

These changes should help move towards generic alerts by modifying
a payload and extract alert presenters.

Standardised punctuation at end of sentences

See merge request gitlab-org/gitlab-ce!32723

Standardise punctuation at end of sentences

See merge request gitlab-org/gitlab-ee!16210

Bring typo fix over from EE

See merge request gitlab-org/gitlab-ce!32802

Fix issue causing linting test failures

See merge request gitlab-org/gitlab-ce!32801

Add auto_sign_in_with_provider info to OmniAuth doc

See merge request gitlab-org/gitlab-ce!32416

fix for #60120

See merge request gitlab-org/gitlab-ce!30199

Replace GDK ref

See merge request gitlab-org/gitlab-ce!32621

Bump fog-google to support ADC auth on GCP

Closes gitlab-ee#14810

See merge request gitlab-org/gitlab-ce!32775

Avoid calling freeze on already frozen strings in app/helpers

See merge request gitlab-org/gitlab-ce!32789

Normalize import_export structure

See merge request gitlab-org/gitlab-ce!32704

Updated description in the Gitlab Prometheus metrics section

See merge request gitlab-org/gitlab-ce!32280

Add method to authorize reading from prometheus proxy

Closes #63044

See merge request gitlab-org/gitlab-ce!32305

Add prometheus proxies

See merge request gitlab-org/gitlab-ee!15700

This adds prometheus proxies for project and group clusters. This will
be used for cluster metrics dashboards similar to how we currently do
environment metrics.