fix: removing mentions validation (WPB-20317) (#3824)

Author: sbakhtiarov

domain/backup/src/commonMain/kotlin/com/wire/backup/data/BackupData.kt

@@ -170,12 +170,6 @@ public sealed class BackupMessageContent {
         @SerialName("mentions") val mentions: List<Mention> = emptyList(),
         @SerialName("quotedMessageId") val quotedMessageId: String? = null
     ) : BackupMessageContent() {
-        init {
-            mentions.forEach { mention ->
-                require(mention.start + mention.length <= text.length) { "Mention range exceeds text length" }
-            }
-        }
-
         /**
          * Represents a mention of a user in a text.
          *

domain/backup/src/commonTest/kotlin/com/wire/backup/data/BackupContentTextTest.kt

@@ -23,40 +23,6 @@ import kotlin.test.assertFailsWith
 
 class BackupContentTextTest {
 
-    @Test
-    fun givenMentionTooLong_whenCreatingText_thenShouldThrowIAE() {
-        val text = "Hello"
-        val mention = BackupMessageContent.Text.Mention(
-            userId = BackupQualifiedId(id = "user", domain = "example.com"),
-            start = 3,
-            length = 5, // 3 + 5 = 8 > text.length (5)
-        )
-
-        assertFailsWith<IllegalArgumentException> {
-            BackupMessageContent.Text(text = text, mentions = listOf(mention))
-        }
-    }
-
-    @Test
-    fun givenMultipleMentionsWithOnlyOneOutOfBounds_whenCreatingText_thenShouldThrowIAE() {
-        val text = "Hello @alice"
-        val validMention = BackupMessageContent.Text.Mention(
-            userId = BackupQualifiedId(id = "alice-id", domain = "example.com"),
-            start = 6,
-            length = 6, // Valid: 6 + 6 = 12 == text.length
-        )
-        val invalidMention = BackupMessageContent.Text.Mention(
-            userId = BackupQualifiedId(id = "bob-id", domain = "example.com"),
-            start = 10,
-            length = 5, // Invalid: 10 + 5 = 15 > text.length (12)
-        )
-
-        assertFailsWith<IllegalArgumentException> {
-            BackupMessageContent.Text(text = text, mentions = listOf(validMention, invalidMention))
-        }
-    }
-
-
     @Test
     fun givenNegativeStart_whenCreatingMention_thenShouldThrowIAE() {
         assertFailsWith<IllegalArgumentException> {