Enable testFixtures - but not supported by AGP yet, so put files in module matrixtest

features/template/src/test/kotlin/io/element/android/features/template/TemplatePresenterTests.kt

@@ -14,12 +14,15 @@
  * limitations under the License.
  */
 
+@file:OptIn(ExperimentalCoroutinesApi::class)
+
 package io.element.android.features.template
 
 import app.cash.molecule.RecompositionClock
 import app.cash.molecule.moleculeFlow
 import app.cash.turbine.test
 import com.google.common.truth.Truth
+import kotlinx.coroutines.ExperimentalCoroutinesApi
 import kotlinx.coroutines.test.runTest
 import org.junit.Test