[Runtime testing] Store GTest revision in root gradle.properties

runtime/build.gradle.kts

@@ -12,10 +12,7 @@ plugins {
 }
 
 googletest {
-    // The latest release GTest (1.10.0) doesn't properly register skipped tests in an XML-report.
-    // Therefore we use a fixed commit form the master branch where this problem is already fixed.
-    // https://github.com/google/googletest/commit/07f4869221012b16b7f9ee685d94856e1fc9f361
-    revision = "07f4869221012b16b7f9ee685d94856e1fc9f361"
+    revision = project.property("gtestRevision") as String
     refresh = project.hasProperty("refresh-gtest")
 }