feat(ecosystem): Implement cross-system issue synchronization

[ShashankFC]

User description

Test 7

Summary by CodeRabbit

Release Notes

• New Features
  • Enhanced assignment synchronization with cycle prevention to ensure reliable bidirectional syncing between Sentry and integrated external issue tracking systems without infinite loops.

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Replicated from ai-code-review-evaluation/sentry-coderabbit#7

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CodeAnt-AI Description

Prevent assignment sync cycles between Sentry and external issue integrations

What Changed

• Outbound assignment sync now carries the assignment's origin; an integration will skip syncing if it is the same integration that originated the assignment, preventing feedback loops.
• Assignment operations (assign/deassign) include a serialized assignment source so background tasks and inbound handlers can detect and ignore self-originated changes.
• Inbound assignment handling now tags created/deleted assignments with the originating integration and unit tests verify parsing, serialization, and cycle prevention behavior.

Impact

✅ Fewer cross-system assignment loops
✅ Fewer redundant outbound assignment calls
✅ Clearer rejection of self-originated assignment syncs

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[ShashankFC]

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Sequence Diagram

Shows the updated assignment flow where an AssignmentSource is propagated from Sentry assignment -> queued task -> integration installation check. The integration rejects outbound syncs when the assignment source identifies the same integration to avoid cycles.

sequenceDiagram
    participant User
    participant GroupAssignee
    participant QueueTask as "sync_assignee_outbound(task)"
    participant Installation
    participant ExternalIssue

    User->>GroupAssignee: assign/deassign (includes AssignmentSource when inbound)
    GroupAssignee->>QueueTask: enqueue sync_assignee_outbound(assignment_source_dict)
    QueueTask->>Installation: get_installation & should_sync(attribute, sync_source)
    alt sync_source.integration_id != installation.integration_id
        Installation-->>QueueTask: True
        QueueTask->>Installation: sync_assignee_outbound -> update ExternalIssue
        Installation-->>ExternalIssue: update assignee
    else sync_source.integration_id == installation.integration_id
        Installation-->>QueueTask: False (skip outbound sync to prevent cycle)
    end

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