tests: Move ray under toxgen

[sentrivana]

Description

• moving the Ray test suite under toxgen
• removed @pytest.mark.forked and instead:
  • added a fixture to ensure ray is shut down after each test
  • gave each test that was looking at logs its own temporary directory to ensure logs don't get mixed up
• we were only testing Ray on Python 3.10 and 3.11 -- fixing that

Issues

Ref #4506
Closes #4811

Reminders

• Please add tests to validate your changes, and lint your code using tox -e linters.
• Add GH Issue ID & Linear ID (if applicable)
• PR title should use conventional commit style (feat:, fix:, ref:, meta:)
• For external contributors: CONTRIBUTING.md, Sentry SDK development docs, Discord community

[codecov]

✅ All tests passed in 2613.08s