Rename files to preserve history

Test\Eslint fail - this is expected.

Change-Id: If6826a4cc06761935a4fd7de91e3d8c1554ace73
diff --git a/polygerrit-ui/app/elements/admin/gr-repo-commands/gr-repo-commands.js b/polygerrit-ui/app/elements/admin/gr-repo-commands/gr-repo-commands.ts
similarity index 100%
rename from polygerrit-ui/app/elements/admin/gr-repo-commands/gr-repo-commands.js
rename to polygerrit-ui/app/elements/admin/gr-repo-commands/gr-repo-commands.ts