WPB-26650 prevent fed state drift on prevent adminless groups actions

[battermann]

https://wearezeta.atlassian.net/wiki/x/HwB7uw
https://wearezeta.atlassian.net/browse/WPB-26650

Checklist

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

[Copilot]

Pull request overview

This PR updates the “preventAdminlessGroups” handling for federated conversations to avoid senderless system-triggered deletions (and reminders) when remote members are present, preventing remote/backend state drift. It also adds integration tests and documentation describing the new behavior.

Changes:

• Skip senderless adminless deletion/reminder paths for conversations that contain remote members, and log the skip.
• Add integration coverage for federated conversations around setup-time deletion/autopromotion behavior with remote members.
• Document the federated behavior caveats and add a changelog entry.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.

File	Description
libs/wire-subsystems/src/Wire/ConversationSubsystem/Update.hs	Adds the skip predicate + logging and applies it to setup deletion, deletion jobs, and reminder jobs.
integration/test/Test/AdminlessGroups.hs	Adds new integration scenarios for federated conversations with remote members (origin delete, skip senderless delete, autopromotion).
docs/src/developer/reference/config-options.md	Documents the federated skip behavior and rationale for deletion/reminders vs autopromotion.
changelog.d/2-features/WPB-26650	Changelog entry describing the behavior change.

[Copilot]

Pull request overview

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

Suppressed comments (1)

libs/wire-subsystems/src/Wire/ConversationSubsystem/Update.hs:1209

• The log message text hard-codes "deletion" even when used for skipping reminders or scheduling, which makes the info log misleading (e.g. when action is "reminder"). Consider making the message action-neutral and keep action as a structured field for filtering.

  info $
    Log.msg (Log.val "Skipping senderless adminless deletion for conversation with remote members")
      . Log.field "conversation_id" (idToText conv.id_)
      . Log.field "action" action

[blackheaven]

LGTM, except the typo Copilot found