[WPB-22549] fix conv join events

[fisx]

Checklist

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

[Copilot]

Pull request overview

This PR fixes a race condition in conversation join events by filtering out deleted users from the internal user lookup API endpoint. The issue was that deleted users could be returned during user lookups, causing event delivery failures when apps or users tried to add members to conversations.

Changes:

• Modified GET /i/users endpoint to filter out users with Deleted status to prevent race conditions
• Removed test workaround that was skipping assertions for app-to-user conversation events
• Corrected grammar in comment from "Empty list is" to "Empty lists are"

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
services/brig/src/Brig/API/Internal.hs	Adds filtering to exclude deleted users from listActivatedAccountsH and fixes comment grammar
integration/test/Test/Conversation.hs	Removes conditional workaround and increases key package uploads to ensure sufficient packages for all test scenarios
changelog.d/5-internal/WPB-22549-reduce-get-i-users-noise	Documents the internal API change and its purpose

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