fix(MessagesList): clean up expired, removed messages from the chat

[Antreesy]

☑️ Resolves

• Fix regression from Feat(MessagesList): Soft update messages list AND add sticky date separator. #11592
  • Messages that are no longer persisted in the store, should be cleared from rendered list

Tested cases:
// group is older than any known newGroup
[1][2,3],[4,5] => [6] (6 - clear history) - remove all old groups
// at least one message from group is no longer in the store
[1][2,3],[temp-4] => [1][2,3],[4] - replace temporary message
[1][2,3],[4],[5,6] => [1][2,3],[4] (4 - message expiration, all messages after 4 were removed)
[1][2,3],[4,5] => [1][2,3],[6] (mocked case, whole group was removed)
[1][2,3],[4,5] => [1][2,3],[4],[6] (mocked case, non-first message was removed)
[1][2,3],[4,5] => [1][2,3],[5],[6] (mocked case, first message was removed)

🖌️ UI Checklist

🖼️ Screenshots / Screencasts

🏚️ Before	🏡 After

🚧 Tasks

• clear expired and purged messages:
  • from the top of the list
  • from the middle of the list
• Add test coverage for soft update
  • Follow-up: move soft-update logic to test-able composable

🏁 Checklist

• 🌏 Tested with Chrome, Firefox and Safari or should not be risky to browser differences
• 🖥️ Tested with Desktop client or should not be risky for it
• ⛑️ Tests are included or not possible

[DorraJaouad]

Tests look good overall 🦅

[Antreesy]

/backport to stable29