feat(ecosystem): Implement cross-system issue synchronization

[everettbu]

Test 7

[Copilot]

Pull Request Overview

This PR implements cross-system issue synchronization by introducing an assignment source tracking mechanism to prevent sync cycles between integrations. When an assignment originates from an integration, the system can now identify the source and avoid syncing back to the same integration that initiated the change.

Key changes:

• Added AssignmentSource service to track assignment origins with integration metadata
• Modified assignment methods to accept and propagate assignment source information
• Updated sync logic to prevent cycles by checking if the sync target matches the assignment source

Reviewed Changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
src/sentry/integrations/services/assignment_source.py	New service class for tracking assignment sources with integration metadata
src/sentry/models/groupassignee.py	Updated assign/deassign methods to accept assignment source parameter
src/sentry/integrations/utils/sync.py	Modified sync functions to pass assignment source and prevent sync cycles
src/sentry/integrations/tasks/sync_assignee_outbound.py	Updated task to handle assignment source data
src/sentry/integrations/mixins/issues.py	Enhanced should_sync method to check assignment source for cycle prevention
tests/sentry/models/test_groupassignee.py	Added test coverage for assignment source functionality
tests/sentry/integrations/services/test_assignment_source.py	Unit tests for the new AssignmentSource service

[Copilot]

Method name contains a typo: 'inalid' should be 'invalid'.

Suggested change

	def test_from_dict_inalid_data(self):
	def test_from_dict_invalid_data(self):

[Copilot]

The sync_status_outbound method signature is updated to include assignment_source parameter, but this appears to be an abstract method. All implementing classes will need to be updated to match this new signature, which could be a breaking change.

Suggested change

	external_issue,
	is_resolved,
	project_id,
	assignment_source: AssignmentSource | None = None,
	**kwargs,
	):
	external_issue: ExternalIssue,
	is_resolved: bool,
	project_id: int,
	assignment_source: AssignmentSource | None = None,
	**kwargs: Any,
	) -> None:

[Copilot]

Using timezone.now() as a default field value will set the same timestamp for all instances created at import time, not at instantiation time. This should be a factory function or set in post_init.

Suggested change

	queued: datetime = timezone.now()
	queued: datetime = field(default_factory=timezone.now)