feat(rum): add rum_replay_playlists resource (shell only)

[michael-richey]

Summary

RUM replay playlists — static shell definitions (name, description). Syncs the playlist shell only (full CRUD); the playlist→session associations (intake-tied) are out of scope.

Stacked on #720 (rum_operation_strong_links).

Feasibility spike result

The plan flagged a concern that playlists might embed session-id references that can't be cleanly stripped. Inspection of the Playlist schema confirms the playlist body (name, description) contains no session ids — session associations live on the separate .../sessions sub-resources. So the shell is clean; no stripping required.

Design

• List GET /rum/replay/playlists; create POST; update PUT /{playlist_id}; delete DELETE /{playlist_id}.
• Create data has no id (server-assigned, popped); update sets resource["id"] = destination_id.
• excluded_attributes: id + server-managed created_at/updated_at/created_by/session_count.
• No resource_connections (playlists are org-level, not app-scoped; no session refs in the shell).
• Does not call the .../sessions sub-resources (intake-tied, out of scope).

Changes

• datadog_sync/model/rum_replay_playlists.py (new)
• datadog_sync/models/__init__.py — register
• tests/unit/test_rum_replay_playlists.py (new) — 6 unit tests
• README.md — add rum_replay_playlists (no dependencies)

Testing

• pytest tests/unit/test_rum_replay_playlists.py → 6 passed
• Full unit suite: no new failures.

Follow-up

Integration tests + VCR cassettes deferred (require sandbox-org API access).

[michael-richey]

Looks good.

The model stays nicely scoped to playlist shell sync only (and avoids sessions sub-resources), and unit tests cover CRUD semantics and payload shaping well.

No blockers from my side in this diff.

[Copilot]

Copilot review overview

🟢 Approval recommended

The implementation is consistent with adjacent RUM models and has focused coverage for all introduced operations.

Review effort: Balanced
Findings: None

What changed in this PR

Adds shell-only synchronization for RUM replay playlists with full CRUD support while excluding session associations.

Changes:

• Implements and registers the playlist resource model.
• Adds focused CRUD unit tests.
• Documents support and dependencies.

File	Description
datadog_sync/​model/​rum_replay_playlists.py	Implements playlist shell synchronization.
datadog_sync/​models/​__init__.py	Registers the resource model.
tests/​unit/​test_rum_replay_playlists.py	Tests endpoint and CRUD behavior.
README.md	Documents the resource and its lack of dependencies.

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[michael-richey]

Nice addition — resource model and tests are straightforward and readable.

Non-blocking suggestion:

• The replay playlist list endpoint supports page params (page[number], page[size]). If we expect orgs with many playlists, adding pagination here would make imports more robust and consistent with other paginated resources.

No blocking issues otherwise.