Allow CI_JOB_TOKEN to push to allowlisted repositories
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### Proposal
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In https://gitlab.com/gitlab-org/gitlab/-/merge_requests/154111, we added the ability for CI_JOB_TOKEN to make git pushes to its own repository. The feature flag `push_repository_for_job_token_allowed` was introduced in v17.2
In the associated issue for this functionality, https://gitlab.com/gitlab-org/gitlab/-/issues/389060, there are multiple conversations about a future iteration where the CI_JOB_TOKEN can be used to push git changes to other repositories, if the originating repository is on the target repository's [job token allowlist](https://docs.gitlab.com/ee/ci/jobs/ci_job_token.html#add-a-group-or-project-to-the-job-token-allowlist).
Issue threads about this:
- https://gitlab.com/gitlab-org/gitlab/-/issues/389060#note_1398134444
- https://gitlab.com/gitlab-org/gitlab/-/issues/389060#note_1760932298
Several customers have expressed interest in this capability:
- https://gitlab.com/gitlab-org/gitlab/-/issues/389060#note_1586379595
- https://gitlab.com/gitlab-org/gitlab/-/issues/389060#note_1763444273
- https://gitlab.zendesk.com/agent/tickets/458069 (internal)
- https://gitlab.zendesk.com/agent/tickets/559609 (internal)
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