fix(backend/scheduler): Unbreak Scheduler.get_execution_schedules

[Pwuts]

• Resolves Fix GET /api/schedules error on report_late_executions job #9918
• Follow-up fix for feat(backend): Introduce late execution check scheduled job #9914

Changes 🏗️

• In get_graph_execution_schedules, skip jobs when their kwargs can't be parsed as GraphExecutionJobArgs
• Rename methods of Scheduler to clarify their scope (scheduled graph executions)

Checklist 📋

For code changes:

• I have clearly listed my changes in the PR description
• I have made a test plan
• I have tested my changes according to the test plan:
  • Go to /library/agents/[id] (which calls GET /api/schedules)
    • -> GET /api/schedules request returns HTTP 200

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[deepsource-io]

Here's the code health analysis summary for commits ac8ef9b..245d8f7. View details on DeepSource ↗.

Analysis Summary

Analyzer	Status	Summary	Link
JavaScript	✅ Success		View Check ↗
Python	✅ Success	❗ 13 occurences introduced 🎯 14 occurences resolved	View Check ↗

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