[Chapel Merge] Clarify Python format check job naming

Branch: refs/heads/main
Revision: f65d2f6b0ef2de8780189ba55794f09978610f73
Author: arifthpe
Link: Clarify Python format check job naming by arifthpe · Pull Request #29267 · chapel-lang/chapel · GitHub
Log Message:
Clarify Python format check job naming (#29267)

Clarify the name of the check-format job (now check-python-format),
and add names to each of its steps which run black, to distinguish
them.

[reviewed by @jabraham17 , thanks!]

Compare: Comparing b252ebf0a3eb8678638645a85eff9145e573012f...fa63723869cee38bd90d205c60ab22c4f30b5f44 · chapel-lang/chapel · GitHub

Diff:
M .github/workflows/core-ci-checks.yml
https://github.com/chapel-lang/chapel/pull/29267.diff