Add symbols generation to GH Actions (#18033)
Part of #17878
Summary of the issue:
Symbols generation is missing from GitHub actions, which needs to be
added to have full parity to AppVeyor
Description of user facing changes
None
Description of development approach
Copied logic from AppVeyor
Testing strategy:
- [x] Test symbol artifact is created
- [ ] Test symbols are uploaded to mozilla with a try build
Known issues with pull request:
Symbols upload to mozilla is currently broken
