Update Auto-Qual WebUI to allow firmware version specification

Testing instructions:
1. Test in conjunction with RPC and proto changes.
2. Go to auto-qual > schedule test effort.
3. Schedule an avs/firmware testplan run and specify firmware versions for the test.
4. Verify the firmware versions show up correctly on the scheduling backend.

Change-Id: I716c2287e9458003fed2c54c194b9aba14653bb2
Bug: b:559775353
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/satlab/+/8619772
Reviewed-by: Rafał Gaweł <rafalgawel@google.com>
Tested-by: Kuba Birecki <kbirecki@google.com>
Auto-Submit: Kuba Birecki <kbirecki@google.com>
Commit-Queue: Kuba Birecki <kbirecki@google.com>