github: Update workflows to use the 'case' function

[bkeryan]

• This contribution adheres to CONTRIBUTING.md.

What does this Pull Request accomplish?

Update GitHub Actions workflows to add the new 'case' function ( https://github.blog/changelog/2026-01-29-github-actions-smarter-editing-clearer-debugging-and-a-new-case-function/ ) rather than bash scripts or ${{ condition && true-value || false-value }}.

Why should this Pull Request be merged?

Clarify intent & improve readability

Avoid using bash in sync_github_issues_to_azdo.yml

What testing has been done?

Tested in a personal fork of the repo:

• sync_github_issues_to_azdo.yml: https://github.com/bkeryan/nitypes-python/actions/runs/24051896662/job/70149320202
• publish.yml: https://github.com/bkeryan/nitypes-python/actions/runs/24051835682/job/70149440265

[github-actions]

Test Results

    56 files  ±0      56 suites  ±0   25m 19s ⏱️ - 1m 36s
 2 322 tests ±0   2 322 ✅ ±0   0 💤 ±0  0 ❌ ±0 
66 412 runs  ±0  66 400 ✅ ±0  12 💤 ±0  0 ❌ ±0 

Results for commit 57d7f5a. ± Comparison against base commit f885ba4.