ref(integrations): Move webhook creation to post-create hook

[wedamija]

build_repository_config for GitLab, Bitbucket, and Bitbucket Server created webhooks eagerly before checking if the repo already existed in Sentry. This blocked adding those providers to the repo sync task, since it would create webhooks for every repo on every sync run.

This introduces on_create_repository hook that fires only after a repo is actually persisted. Webhooks are now created at the right time and skipped if the repo already has one. This unblocks adding all remaining SCM providers to the periodic sync.

[cursor]

Cursor Bugbot has reviewed your changes and found 2 potential issues.

Bugbot Autofix prepared fixes for both issues found in the latest run.

• ✅ Fixed: Config overwrite defeats webhook_id guard check
  • Modified _update_repository to preserve existing webhook_id before applying new config, preventing duplicate webhook creation.
• ✅ Fixed: Existing repo update silently loses webhook_id reference
  • Added webhook_id preservation in create_repository's existing repo update path to prevent KeyError on deletion.

Or push these changes by commenting:

@cursor push 00ccd942f5

Preview (00ccd942f5)

diff --git a/src/sentry/plugins/providers/integration_repository.py b/src/sentry/plugins/providers/integration_repository.py
--- a/src/sentry/plugins/providers/integration_repository.py
+++ b/src/sentry/plugins/providers/integration_repository.py
@@ -192,8 +192,11 @@
             if repositories:
                 # We anticipate to only update one repository, but we update any duplicates as well.
                 for repo in repositories:
+                    existing_webhook_id = repo.config.get("webhook_id") if repo.config else None
                     for field_name, field_value in repo_update_params.items():
                         setattr(repo, field_name, field_value)
+                    if existing_webhook_id:
+                        repo.config["webhook_id"] = existing_webhook_id
                     repository_service.update_repository(
                         organization_id=organization.id,
                         update=repo,
@@ -206,8 +209,11 @@
     def _update_repository(self, repo: RpcRepository, config: RepositoryConfig):
         repo.status = ObjectStatus.ACTIVE
 
+        existing_webhook_id = repo.config.get("webhook_id") if repo.config else None
         for field_name, field_value in config.items():
             setattr(repo, field_name, field_value)
+        if existing_webhook_id and "config" in config:
+            repo.config["webhook_id"] = existing_webhook_id
         return repo
 
     def _update_repositories(

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