Fix missing test data files dependency in rllib/BUILD

[Riatre]

Why are these changes needed?

See #26334 and #26517 for context.

Once this is in, it should be good to roll-forwrad again.

Related issue number

Checks

• I've run scripts/format.sh to lint the changes in this PR.
• I've included any doc changes needed for https://docs.ray.io/en/master/.
• I've made sure the tests are passing. Note that there might be a few flaky tests, see the recent failures at https://flakey-tests.ray.io/
• Testing Strategy
  • Unit tests
  • Release tests
  • This PR is not tested :(

[Riatre]

To clarify, this PR should fix master, but it does not conflict with the rollback one (#26517) and I plan to roll-forward again with this change merged if the rollback happens. Please go ahead with the rollback if it unblocks you faster.

Also, is there a good way to make sure all RLLib tests will be run for a pull request, so I can make sure it works in later roll-forward attempt? I missed this in #26334 because I didn't touch anything under rllib/ and ci/pipeline/determine_tests_to_run.py decided that RAY_CI_RLLIB_DIRECTLY_AFFECTED=0...

[pcmoritz]

Thanks for fixing this! Before we merge the new roll-forward PR, let's have one CI run where you just set all the variables in https://github.com/ray-project/ray/blob/master/ci/pipeline/determine_tests_to_run.py#L257 to 1 (you can do this in a temporary commit in the PR) to make sure we caught all such problems that can happen in advance :)