feat(backend): Agent Presets backend improvements

[Pwuts]

• Part of #9307

• ❗ Blocks #9541

Changes 🏗️

Backend:

• Fix+improve GET /library/presets (list_presets) endpoint

  • Fix pagination
  • Add graph_id filter parameter

• Allow partial preset updates: PUT /presets/{preset_id} -> PATCH /presets/{preset_id}

• Allow creating preset from graph execution through POST /presets

• Clean up models & DB functions

  • Split upsert_preset into create_preset + update_preset
  • Add LibraryAgentPresetUpdatable
  • Replace CreateLibraryAgentPresetRequest with LibraryAgentPresetCreatable
    • Use LibraryAgentPresetCreatable as base class for LibraryAgentPreset
  • Remove redundant set_is_deleted_for_library_agent(..)
  • Improve log statements
  • Improve DB statements (e.g. by using unique keys where possible)

Frontend:

• Add timestamp parsing logic to library agent preset endpoints
• Brand LibraryAgentPreset.id + references

Checklist 📋

For code changes:

• [x] I have clearly listed my changes in the PR description
• [x] I have made a test plan
• [x] I have tested my changes according to the test plan:
  • [x] CI green
  • Since these changes don't affect existing front-end functionality, no additional testing is needed.

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[majdyz]

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