PM-34228: feat: Add feature flag for forthcoming attachment updates (#6739)

core/src/main/kotlin/com/bitwarden/core/data/manager/model/FlagKey.kt

@@ -38,6 +38,7 @@ sealed class FlagKey<out T : Any> {
                 ArchiveItems,
                 SendEmailVerification,
                 MobilePremiumUpgrade,
+                AttachmentUpdates,
             )
         }
     }
@@ -116,6 +117,14 @@ sealed class FlagKey<out T : Any> {
         override val defaultValue: Boolean = false
     }
 
+    /**
+     * Data object holding the feature flag key for the Attachment Feature Updates.
+     */
+    data object AttachmentUpdates : FlagKey<Boolean>() {
+        override val keyName: String = "pm-34224-mobile-attachment-updates"
+        override val defaultValue: Boolean = false
+    }
+
     //region Dummy keys for testing
     /**
      * Data object holding the key for a [Boolean] flag to be used in tests.

core/src/test/kotlin/com/bitwarden/core/data/manager/model/FlagKeyTest.kt

@@ -40,6 +40,10 @@ class FlagKeyTest {
             FlagKey.MobilePremiumUpgrade.keyName,
             "PM-31697-premium-upgrade-path",
         )
+        assertEquals(
+            FlagKey.AttachmentUpdates.keyName,
+            "pm-34224-mobile-attachment-updates",
+        )
     }
 
     @Test
@@ -54,6 +58,7 @@ class FlagKeyTest {
                 FlagKey.ArchiveItems,
                 FlagKey.SendEmailVerification,
                 FlagKey.MobilePremiumUpgrade,
+                FlagKey.AttachmentUpdates,
             ).all {
                 !it.defaultValue
             },