Make verification screens scrollable and emoji labels multiline (#4449)

* Make self verification screens scrollable

* Remove unused fields from `VerificationEmoji`

* Make only the header and content scroll in `HeaderFooterPage`.

* Use the right 'emoji' icon in both flows (`ReactionSolid`)

---------

Co-authored-by: ElementBot <android@element.io>

libraries/matrix/api/src/main/kotlin/io/element/android/libraries/matrix/api/verification/SessionVerificationData.kt

@@ -25,6 +25,4 @@ sealed interface SessionVerificationData {
 // https://spec.matrix.org/unstable/client-server-api/#sas-method-emoji
 data class VerificationEmoji(
     val number: Int,
-    val emoji: String,
-    val description: String,
 )

libraries/matrix/impl/src/main/kotlin/io/element/android/libraries/matrix/impl/verification/RustSessionVerificationService.kt

@@ -274,8 +274,6 @@ private fun RustSessionVerificationData.map(): SessionVerificationData {
                         emoji.use { sessionVerificationEmoji ->
                             VerificationEmoji(
                                 number = sessionVerificationData.indices[index].toInt(),
-                                emoji = sessionVerificationEmoji.symbol(),
-                                description = sessionVerificationEmoji.description(),
                             )
                         }
                     },