[Tune][CI] Skip zoopt invalid values test

[justinvyu]

Skips a zoopt searcher test that's causing the test_searchers suite in CI to be flaky. Skipping as this is not a Tune issue and needs to be fixed in the zoopt library.

Why are these changes needed?

I re-enabled this test in https://github.com/ray-project/ray/pull/31147 since I thought that nan/inf error handling had been fixed in a recent zoopt release. However, nan/inf values will still cause an error if reported on trial complete.

This test should be enabled after https://github.com/polixir/ZOOpt/pull/7 is included in the next zoopt release.

Related issue number

Checks

• [x] I've signed off every commit(by using the -s flag, i.e., git commit -s) in this PR.
• [x] 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 :(