update tests for room v12

[FrenchGithubUser]

Update tests to pass with room v12

Depends on: element-hq/synapse#19898

TODO: before merging, revert the changes in pipeline.yml Done in 9b177e9.

[Copilot]

Pull request overview

Updates SyTest’s federation helpers and test expectations to accommodate Matrix room v12 semantics (hash-based room IDs, m.room.create lacking room_id, and creator power-level changes), and sets the default test room version to 12 to exercise these paths by default.

Changes:

• Add room-version helpers and apply v12-specific logic for room IDs and auth_events handling in federation event construction.
• Update multiple federation tests to build auth_events correctly for v12 and adjust assertions for v12 create events / creator power levels.
• Temporarily adjust CI pipeline to pull a Synapse branch with room v12 support (noted as TODO to revert before merging).

Reviewed changes

Copilot reviewed 14 out of 14 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
tests/50federation/52soft-fail.pl	Use auth_event_refs when constructing auth_events so v12 create events aren’t referenced.
tests/50federation/36state.pl	Use auth_event_refs for rejected-event construction to keep v12 auth_events valid.
tests/50federation/33room-get-missing-events.pl	Use auth_event_refs for membership event auth chain construction under v12.
tests/50federation/31room-send.pl	Use auth_event_refs for auth chain construction under v12.
tests/50federation/30room-join.pl	Relax room_id requirement to allow v12 create events without room_id (and adjust validation logic).
tests/31sync/09archived.pl	Serialize room creation to avoid possible v12 room-ID collisions from identical create events.
tests/30rooms/60version_upgrade.pl	Pin specific tests to room v11 to continue testing pre-v12 upgrade behaviors.
tests/30rooms/01state.pl	Adjust creator power-level expectations depending on whether the room is v12+.
run-tests.pl	Default $TEST_ROOM_VERSION to 12.
lib/SyTest/Federation/Room.pm	Add auth_event_refs; implement v12 room-id derivation from create event; omit create from auth_events in v12.
lib/SyTest/Federation/Datastore.pm	Allow v12 create events without room_id; factor ref decoding into _event_ref_ids for v12 compatibility.
lib/SyTest/Federation/Client.pm	Advertise support for room version 12.
lib/Protocol/Matrix.pm	Add room_version_is_11_plus / room_version_is_12_plus helpers and use them in redaction/version logic.
.github/workflows/pipeline.yml	Temporarily hardcode Synapse download source to a room-v12 branch (TODO says to revert).

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[anoadragon453]

Thanks for your patience on this one. Just a few small things below.

[anoadragon453]

The associated Synapse PR has now been merged.

[anoadragon453]

Thanks for sticking with this one! This now LGTM.