Add confirmation dialog when inviting users with unknown identities (#6523)

* feat: Add confirmation modal when inviting unknown users

* tests: Add preview tests for invite confirmation modal

* tests: Add unit tests for invite confirmation modal

* feat: Switch confirmation sheet contents based on identity state

* tests: Add history sharing unit tests for `DefaultStartDMActionTest`

* tests: Update snapshots for `CreateDmConfirmationBottomSheet`

* chore: Fix tiny nits

* fix: Remove default param on `ConfirmingStartDmWithMatrixUser`

* refactor: Use new AsyncAction over boolean flag

* fix: Add sleeps to tests

* refactor: Remove `PromptOrInvite` and switch on async action

* fix: Remove redundant `assertThat`

* feat: Alllow invite confirmation modal to be dismissed

* tests: Update snapshots for InvitePeopleView

* fix: Adjust `CreateDmConfirmationBottomSheet` to conform to design

* feat: Use localazy translations and plurals

* fix: When users are unselected, unselect them in search results too

* tests: Use aMatrixUserList to provide multiple users

* Update screenshots

* fix: Add missing parameter in UserProfilePresenterTest

---------

Co-authored-by: Andy Balaam <andy.balaam@matrix.org>
Co-authored-by: ElementBot <android@element.io>

features/startchat/api/src/main/kotlin/io/element/android/features/startchat/api/ConfirmingStartDmWithMatrixUser.kt

@@ -13,4 +13,5 @@ import io.element.android.libraries.matrix.api.user.MatrixUser
 
 data class ConfirmingStartDmWithMatrixUser(
     val matrixUser: MatrixUser,
+    val isUserIdentityUnknown: Boolean,
 ) : AsyncAction.Confirming