This reverts commit 0a5f970.

Why are these changes needed?

This is a breaking change and beaks release test.

2025-04-06 23:31:38,300	PANIC scripts.py:748 -- `--labels={"anyscale.com/availability_zone":"us-west-2a"}` is not a valid string of key-value pairs, detail error:Label value is not a key-value pair.Valid values look like this: `--labels="key1=val1,key2=val2"`
Error: `{}` is not a valid string of key-value pairs, detail error:{}Valid values look like this: `{}`

Related issue number

Checks

• I've signed off every commit(by using the -s flag, i.e., git commit -s) in this PR.
• 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 added any new APIs to the API Reference. For example, if I added a
    method in Tune, I've added it in doc/source/tune/api/ under the
    corresponding .rst file.
• 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 :(