TestProjectInvalidation: Add generic method to make project.config invalid

For tests that check behaviour for projects with an invalid
project.config file (Gerrit throws ConfigInvalidException on load) it is
not relevant how the project.config file is made invalid. Hence these
tests should not need to specify a specific project.config update that
invalidates the project.config file. Add a new method to
TestProjectInvalidation that allows them to invalidate the
project.config file without specifying an update step.

Signed-off-by: Edwin Kempin <ekempin@google.com>
Change-Id: I0bd144101addf0c4b009516c40517c5a1f83a8f7

javatests/com/google/gerrit/acceptance/api/project/ProjectIT.java

@@ -894,14 +894,10 @@ public class ProjectIT extends AbstractDaemonTest {
 
   @Test
   public void getProjectThatHasInvalidProjectConfig() throws Exception {
-    // Make the project config invalid by adding permission entry with an invalid permission name.
     projectOperations
         .project(allProjects)
         .forInvalidation()
-        .addProjectConfigUpdater(
-            cfg ->
-                cfg.setString(
-                    "access", "refs/*", "Invalid Permission Name", "group Administrators"))
+        .makeProjectConfigInvalid()
         .invalidate();
 
     // We must test this via the REST API since ExceptionHook is not invoked from the Java API.