Rename gr-change-metadata_test to ts

Change-Id: I8e528e7f94f6e3b723940a38ed0e902227e7a72e
diff --git a/polygerrit-ui/app/elements/change/gr-change-metadata/gr-change-metadata_test.js b/polygerrit-ui/app/elements/change/gr-change-metadata/gr-change-metadata_test.ts
similarity index 100%
rename from polygerrit-ui/app/elements/change/gr-change-metadata/gr-change-metadata_test.js
rename to polygerrit-ui/app/elements/change/gr-change-metadata/gr-change-metadata_test.ts