[Core][BugFix] Remove extra field _require_fuse in Resources.to_yaml_config()

[cblmemo]

Fixes #3456

Tested (run the relevant ones):

• Code formatting: bash format.sh
• Any manual or new tests for this PR (please specify below)

[GCC 11.2.0] :: Anaconda, Inc. on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import sky
>>> sky.Resources().to_yaml_config()
{'disk_size': 256}

• All smoke tests: pytest tests/test_smoke.py
• Relevant individual smoke tests: pytest tests/test_smoke.py::test_fill_in_the_name
• Backward compatibility tests: bash tests/backward_comaptibility_tests.sh

[Michaelvll]

Thanks for fixing this @cblmemo! Could we fix the schemas.py as well for those fields? It seems if it is included in the task yaml, and sent to the spot or serve controller, it will not be able to be loaded due to the schema check.

[Michaelvll]

Approving this PR and merging it first to unblock sky spot launch and sky serve up. We can fix the comments above in another PR.

[cblmemo]

Thanks for fixing this @cblmemo! Could we fix the schemas.py as well for those fields? It seems if it is included in the task yaml, and sent to the spot or serve controller, it will not be able to be loaded due to the schema check.

IIUC this is an internal usage and it should not be allowed..? And after this PR, it should not produce such field on the spot/serve controllers?