Fix ManifestMergerAction test case on windows

`manifest.toString().replaceFirst("^/", "")` silently fails on windows machines causing `removePermissions` to write to the original test file. This pull request creates a new temp file that `removePermissions` can write the modified manifest to.

Pulling this change out of another PR so that it's easier to merge. Original PR here https://github.com/bazelbuild/bazel/pull/13445/files#r631575251

Closes #13760.

PiperOrigin-RevId: 438643774

src/tools/android/java/com/google/devtools/build/android/ManifestMergerAction.java

@@ -173,9 +173,8 @@ private static Path removePermissions(Path manifest, Path outputDir)
         }
       }
     }
-    // Write resulting manifest to the output directory, maintaining full path to prevent collisions
-    Path output = outputDir.resolve(manifest.toString().replaceFirst("^/", ""));
-    Files.createDirectories(output.getParent());
+    // Write resulting manifest to a tmp file to prevent collisions
+    Path output = Files.createTempFile(outputDir, "AndroidManifest", ".xml");
     TransformerFactory.newInstance()
         .newTransformer()
         .transform(new DOMSource(doc), new StreamResult(output.toFile()));