Migrate room to use Gradle Version Catalogs

- Ran development/versionCatalogMigrate.sh in room/
- Manually updated imports in build.gradle files

Test: ./gradlew tasks
Change-Id: Ia70bd32a5f1167efcf1f5c1a6844b5f92572c098
diff --git a/room/rxjava2/build.gradle b/room/rxjava2/build.gradle
index 2a9be6c..1594929 100644
--- a/room/rxjava2/build.gradle
+++ b/room/rxjava2/build.gradle
@@ -14,10 +14,7 @@
  * limitations under the License.
  */
 
-import static androidx.build.dependencies.DependenciesKt.*
 import androidx.build.LibraryGroups
-import androidx.build.LibraryVersions
-import androidx.build.AndroidXExtension
 import androidx.build.Publish
 
 plugins {
@@ -29,10 +26,10 @@
     api(project(":room:room-common"))
     api(project(":room:room-runtime"))
     implementation("androidx.arch.core:core-runtime:2.0.1")
-    api(RX_JAVA)
+    api(libs.rxjava2)
 
-    testImplementation(JUNIT)
-    testImplementation(MOCKITO_CORE)
+    testImplementation(libs.junit)
+    testImplementation(libs.mockitoCore)
     testImplementation("androidx.arch.core:core-testing:2.0.1")
     testImplementation("androidx.lifecycle:lifecycle-livedata:2.0.0") // for mocking invalidation tracker
 }