[CHA-2758] Add tests for future channel bans without channel CID

[nijeesh-stream]

Ticket

• https://linear.app/stream/issue/CHA-2758/allow-future-channel-bans-without-channel-cid

Summary

• Add integration tests for the new backend capability that allows ban_from_future_channels without requiring a channel_cid
• The Java SDK model already supports this (fields were added in v1.39.0 via [CHA-1703]), and the backend validation was relaxed in chat PR #12582

Tests added

Test	Coverage
whenBanFromFutureChannelsWithoutChannelCid_thenSucceeds	Creates FCB without channel_cid, verifies record via queryFutureChannelBans, asserts user is NOT globally banned
whenBanFromFutureChannelsWithoutCid_thenAutoAppliedToNewChannels	Creates FCB without CID, creates a new channel by the banner with target as member, verifies target is auto-banned in that channel
whenBanFromFutureChannelsWithoutCidAndShadow_thenPreservesShadow	Creates shadow FCB without CID, verifies shadow=true is preserved on the FCB record
whenRemovingFutureChannelBanWithoutCid_thenBanIsRemoved	Full lifecycle: create FCB, verify exists, remove via unban().removeFutureChannelsBan(true).createdBy(), verify removed
whenBanFromFutureChannelsWithoutCidAndTimeout_thenExpirationSet	Creates FCB without CID with timeout(60), verifies expires field is set

Checklist

• Tests cover the new backend behavior (ban_from_future_channels without channel_cid)
• Tests mirror scenarios from backend Go tests and QA TypeScript tests
• All tests include proper cleanup (unban after ban)

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