[res] Add a Theme::Rebase() benchmark + fix data

- Create a new benchmark targeting the Theme::Rebase() method
  specifically

- Fix the benchmark data so it doesn't try to run every data
  apk as a test on the device, and include the missing projects

- A minor style improvement

Flag: NONE A set of benchmark improvements
Bug: 345562237
Test: build, boot, atest + performance tests

Change-Id: If9d92a288ec9513ef9cefbb77490a49d4fb8d596