Add .mvn directories to IT tests projects that lack one

Some of the integration tests to do not have `.mvn` directories and
search up the project structure until they find the `.mvn` directory
of the root project.

This change adds `.mvn` directories with empty `maven.config` files so
that the sample projects in VCS will be as close as possible to those
executed during integration testing

integration-tests/src/test/java/org/mvndaemon/mvnd/junit/MvndTestExtension.java

@@ -204,6 +204,11 @@ public static MvndResource create(
                         }
                     });
                 }
+
+                final Path dotMvn = testExecutionDir.resolve(".mvn");
+                if (!Files.exists(dotMvn)) {
+                    Files.createDirectories(dotMvn);
+                }
             }
             final Path multiModuleProjectDirectory =
                     Paths.get(DaemonParameters.findDefaultMultimoduleProjectDirectory(testExecutionDir));