* Add a banner to encrypted rooms with visible history. (#4738)
* feat: Add history visible alert.
- Adds a dismissable alert that is displayed whenever the user
opens a room with `history_visibility` != `joined`. When cleared,
this is recorded in the app's data store.
- When opening a room with `history_visibility` = `joined`, this
flag is cleared.
Issue: element-hq/element-meta#2875
* tests: Add unit tests for history sharing in `RoomScreenFooterView`.
* feat: Rename flag to `hasSeenHistoryVisibleBannerRooms`, document.
* refactor: Merge enum variants, use function for banner description.
* feat: Use `AppSettings.historyVisibleDetailsURL` over hard-coded value.
* tests: Correct potential race condition with deferred assertion.
* chore: Use Localazy translation string over project-defined.
* fix: Final tweaks and review comments.
* chore: Checkout `Enterprise` submodule.
* tests: Final fixes.
* fix: Condition banner visibility on feature flag state.
* fix: Prioritise identity violations over history visibility banner.
* tests: Add snapshots for history visible banner.
* tests: Use deferred failure timeout for improved test power.
* chore: Tweaks to spelling, simplify state logic.
* fix: Remove "g".
* fix: Show banner for shared/world-readable rooms, not invited.
* refactor: Use `else-if` instead of `if`.
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