Raise early for invalid revision in load_dataset

[Scott-Simmons]

Solves #7928

Raise early for invalid revisions

[Scott-Simmons]

Passes

pytest -k "LoadTest and test_load_dataset_invalid_revision_with_cache"

Fails

git checkout cc2399019a3a547ebc31ec68a1ff99abd4ec93ce
pytest -k "LoadTest and test_load_dataset_invalid_revision_with_cache"

Ran make test, but failures look unrelated to the PR diff (same tests fail on main too)

FAILED tests/test_distributed.py::test_torch_distributed_run[False] - TypeError: Passing coroutines is forbidden...
FAILED tests/test_distributed.py::test_torch_distributed_run[True] - TypeError: Passing coroutines is forbidden...
FAILED tests/test_distributed.py::test_torch_distributed_run_streaming_with_num_workers[2-2] - TypeError: Passing coroutines is forbidden...
FAILED tests/test_distributed.py::test_torch_distributed_run_streaming_with_num_workers[3-2] - TypeError: Passing coroutines is forbidden...
= 4 failed, 3077 passed, 18 skipped, 491 warnings in 556.45s (0:09:16) =
make: *** [Makefile:20: test] Error 1