ref: Remove unused PUT handler from repository details endpoint

[evanpurkhiser]

With repositories now auto-synced 1:1 from SCM providers, the frontend no longer exposes a way to hide or restore repositories. Datadog shows zero PUT calls to this endpoint in the last 7 days (vs. thousands in the 30 days before that, while the UI was still calling it).

This removes the now-dead surface area:

• The PUT method on OrganizationRepositoryDetailsEndpoint and its RepositorySerializer
• The repository_cascade_delete_on_hide Celery task, whose only caller was that PUT handler, along with its tests and mypy weaklist entries
• Inlined _get_repository_child_relations into RepositoryDeletionTask — its other caller is gone, and the comment distinguishing "hide" vs "delete" relations no longer applies

GET and DELETE on the endpoint are unchanged. DELETE is still receiving ~15 non-browser calls/day, so leaving it in place for now.

[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.

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[sentry]

Bug: The deleted module sentry.tasks.repository is still referenced in TASKWORKER_IMPORTS, which will prevent the taskworker from starting.
_{Severity: CRITICAL}

Suggested Fix

Remove the string "sentry.tasks.repository" from the TASKWORKER_IMPORTS list in src/sentry/conf/server.py to align with the module's deletion.

Prompt for AI Agent

Review the code at the location below. A potential bug has been identified by an AI
agent. Verify if this is a real issue. If it is, propose a fix; if not, explain why it's
not valid.

Location: src/sentry/deletions/defaults/repository.py#L15-L41

Potential issue: The `sentry.tasks.repository` module was deleted, but its import path
remains in the `TASKWORKER_IMPORTS` list located in `src/sentry/conf/server.py`. When
the taskworker process starts, it attempts to import all modules specified in this list.
Since `sentry.tasks.repository` no longer exists, this will raise an `ImportError`,
preventing the taskworker from starting. This will cause CI tests like
`test_import_paths` to fail and will lead to a production outage for the taskworker
service.

Also affects:

• src/sentry/conf/server.py

_{Did we get this right? 👍 / 👎 to inform future reviews.}