Add a Compilation OS mode to odrefresh.

When the --compilation-os-mode is set, odrefresh should:
- Unconditionally compile everything
- Write `compilationOsMode="true"` to the cache info and omit
  `lastUpdateMillis`
- On the next boot, `--check` returns `kCompilationRequired`, and
  `--compile` updates the cache info to fill `lastUpdateMillis` but does
  not actually re-compile anything

Bug: 211458160
Test: odsign_e2e_tests
Change-Id: Ie913846d2000f9b57aa0e5133f9d25eb24aa0052
8 files changed