Should only have one HTML ID per page. I've decided to remove
the first of the two duplicate IDs and to replace it with
#vector-variants-dropdown, to match the code style of the similar
#vector-user-links-dropdown
Bug: T343730
Change-Id: I6abdc293c1dbb18faf9751b4633a572a019593ab
- VectorComponentMenuVariants.php is renamed to VectorComponentVariants.php, and returns menu and dropdown data
- Remove TabsMenuContents.mustache in favor of MenuContents.mustache
- Fix the variants dropdown to use the full Menu template
Follow-up: Idf05c1664c026f58487ba34af5ede8a11e695baf
Change-Id: I0e9b1ab3306b04ee0d226048c6885beab4f310c6