WPB-27017 reconcile adminless groups on feature toggle

[battermann]

https://wearezeta.atlassian.net/browse/WPB-27017

Checklist

• Add a new entry in an appropriate subdirectory of changelog.d
• Read and follow the PR guidelines

[Copilot]

Pull request overview

This PR introduces an “adminless setup” reconciliation path that runs when the preventAdminlessGroups team feature is toggled, ensuring existing team conversations are re-checked and the appropriate adminless cleanup jobs are (re)scheduled or canceled.

Changes:

• Add a new AdminlessSetup job type and worker execution path in the background-worker, plus job scheduling/cancellation primitives in JobSubsystem.
• Extend team feature application logic to run feature-specific post-update hooks; implement a hook for PreventAdminlessGroupsConfig that schedules reconciliation and cancels pending jobs on disable/config changes.
• Add “system” conversation events (member-update / delete / adminless-reminder) and integration tests validating reconciliation, cancellation, and notifications.

Reviewed changes

Copilot reviewed 22 out of 22 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
services/galley/src/Galley/API/Teams/Features.hs	Adds feature post-update hook (afterFeatureSet) and wires preventAdminlessGroups toggles to job scheduling/cancellation.
services/background-worker/src/Wire/BackgroundWorker/Workers.hs	Routes the new AdminlessSetup payload type to its worker and adds a payload type name.
services/background-worker/src/Wire/AdminlessJobsWorker.hs	Implements runAdminlessSetupJob to reconcile team conversations and enqueue follow-up adminless jobs.
libs/wire-subsystems/test/unit/Wire/ConversationSubsystem/InterpreterSpec.hs	Updates mock JobSubsystem interpreter to handle new job actions.
libs/wire-subsystems/src/Wire/JobSubsystem/Migrations.hs	Ensures an index exists to support team-scoped cancellation queries over adminless jobs.
libs/wire-subsystems/src/Wire/JobSubsystem/Interpreter.hs	Implements scheduling of setup jobs and team-scoped cancellation via Arbiter operations/queries.
libs/wire-subsystems/src/Wire/JobSubsystem.hs	Extends the JobSubsystem effect with setup scheduling and team cancellation actions.
libs/wire-subsystems/src/Wire/ConversationSubsystem/Update.hs	Adds setupAdminlessGroupsCleanup and emits system events when no origin user exists; refactors adminless scheduling helpers.
libs/wire-subsystems/src/Wire/ConversationSubsystem/Notify.hs	Exposes a pushSystemEvent helper to emit system events via NotificationSubsystem.
libs/wire-subsystems/src/Wire/ConversationSubsystem/Interpreter.hs	Wires new SetupAdminlessGroupsCleanup action to the update logic.
libs/wire-subsystems/src/Wire/ConversationSubsystem.hs	Adds SetupAdminlessGroupsCleanup to the ConversationSubsystem effect.
libs/wire-api/test/unit/Test/Wire/API/Roundtrip/Aeson.hs	Adds roundtrip coverage for AdminlessSetupJob and system event types.
libs/wire-api/test/golden/testObject_ConversationsJobPayload_AdminlessSetup_1.json	Golden JSON for the new conversations job payload variant.
libs/wire-api/test/golden/testObject_AdminlessSetupJob_2.json	Golden JSON for setup job payload including orig_user_id.
libs/wire-api/test/golden/testObject_AdminlessSetupJob_1.json	Golden JSON for setup job payload without orig_user_id.
libs/wire-api/test/golden/Test/Wire/API/Golden/Manual/AdminlessJobs.hs	Adds manual golden objects for AdminlessSetupJob and payload.
libs/wire-api/test/golden/Test/Wire/API/Golden/Manual.hs	Registers new golden test groups for setup job/payload.
libs/wire-api/src/Wire/API/Jobs.hs	Defines AdminlessSetupJob and adds AdminlessSetup to ConversationsJobPayload.
libs/wire-api/src/Wire/API/Event/Conversation.hs	Introduces SystemEvent + SystemEventType and schema/JSON support.
integration/test/Testlib/Cannon.hs	Exports awaitNMatchesResultFor for use in new integration tests.
integration/test/Test/AdminlessGroups.hs	Adds integration coverage for setup-on-enable, cancellation-on-disable, and rescheduling on config change; adds test helpers.
integration/test/Notifications.hs	Updates matchers to recognize the new system event notification types.

[supersven]

I think this could work 👍

I've added some comments that might be worth to be reviewed.

[supersven]

assertSuccess or assertStatus could in my opinion be useful here (and in similar cases).

[battermann]

Yes, I will change it if there are other changes, but I think it is not worth to go through a whole CI cycle just for this.