[ci] add Xcode 15.2 to the suite of tests and remove duplicate CircleCI test environment

[lacostej]

The cleanups in #21777 revealed/caused a duplicate environment in circle. So let's add a more modern one and remove the duplicate.

Checklist

• I've run bundle exec rspec from the root directory to see all new and existing tests pass
• I've followed the fastlane code style and run bundle exec rubocop -a to ensure the code style is valid
• I see several green ci/circleci builds in the "All checks have passed" section of my PR (connect CircleCI to GitHub if not)
• I've read the Contribution Guidelines
• I've updated the documentation if necessary.
• I've added or updated relevant unit tests.

Motivation and Context

Description

Testing Steps

[rogerluan]

Apparently there's an issue with the new one being added 😅 is this a CI issue, or it also doesn't pass locally @lacostej ? I'll retrigger to see if this is not juts flakiness

[lacostej]

Apparently there's an issue with the new one being added 😅 is this a CI issue, or it also doesn't pass locally @lacostej ? I'll retrigger to see if this is not juts flakiness

no it's just #21792 the flaky test. We can merge.