Sort tests by name (partially) in ART's `TEST_MAPPING`.

Output of `art/test/utils/regen-test-files`:

  $ art/test/utils/regen-test-files
  Generated Blueprint files for 664 ART run-tests out of 959 (69%).
  Generated TEST_MAPPING entries for 410 ART run-tests out of 959 (42%):
    410 ART run-tests (100%) in `mainline-presubmit` test group.
     20 ART gtests (95%) in `mainline-presubmit` test group.
    410 ART run-tests (100%) in `presubmit` test group.
     21 ART gtests (100%) in `presubmit` test group.

Test: atest --test-mapping art:presubmit
Change-Id: I2069cbe960e38f01790df702349583636d335878
2 files changed