ci: Run nemo gym unit tests on Github

[chtruong814]

What does this PR do ?

ci: Run nemo gym unit tests on Github

Currently the nemo gym unit tests are only ran as part of our nightly tests. However, we should be able to run this on Github now.

• Add nemo-gym-only test marker
• Updated "other" unit tests to run nemo gym tests
• Fix gym rollout test due to changed expected keys
• Fix gym sanity test by updating the expected json file. It seems that this is now failing after Gym commit was updated recently
  • The test script is updated to always write a actual_test_nemo_gym_sanity.json file if we need to update it again and writes to a Github artifact
  • It seems the main difference with the original file is that Gym removed "strict": true from its tool calls for this test.

https://github.com/NVIDIA-NeMo/Gym/pull/944/changes#diff-b56c7f31b7793b3a4ac265f84f4c84216f1ed15a3fbee855da9674a7da8714ffR571

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[chtruong814]

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[chtruong814]

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[chtruong814]

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[chtruong814]

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[chtruong814]

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