Convert facebookresearch/hydra to GitHub Actions

[jesszzzz]

Pipeline migrated from CircleCI 🎉

PR originally generated with gh actions-importer migrate circle-ci --target-url https://github.com/facebookresearch/hydra.git --output-dir migrate --circle-ci-project hydra

Added the following changes:

• Removed the no longer used AWS and CIRCLE_CI key environment variables
• Removed plugin only test logic, now we just always run all the tests - looks like there was some kind of logic to only run the pipeline tests in certain cases to handle permissions (discussion in avoid running plugin tests on forked PRs #2180) which no longer seem relevant since we're removing these tokens entirely
• Fixed up setup steps to work correctly for linux, windows, and mac
• Fixed the tests to work on windows properly
  • Added quotes around temp directory override since the windows directory contains ~ which messes up the parser without the quotes
  • Forced tests to use the C: drive
  • Forced tests to output in utf-8 (the github windows image seems to be ignoring the PYTHONIOENCODING env var

Note there's probably still some inefficiency in this setup but not a priority to improve it right now.

Test:
See CI signals. Note the CircleCI failure is expected and we'll disable it once this PR is approved.

[Sanjay-Ganeshan]

Mostly changing double quotes to single quotes