test: scratch probe 2 for the expected_head_sha 422 message

[eleshar]

Second scratch branch, same purpose as #3695: observe the exact API response for a mismatched expected_head_sha while the pull request is genuinely behind develop. On #3695 the first (wrong-SHA) call returned 200 and updated the branch, so the mismatch response was never reached. Here the wrong-SHA call is the first request. Not for merge; will be closed and deleted.

Labels: type:ci, area:ci, priority:minor, status:needs-review.

Linked issues

Relates to #3693, #3574

Checklist (Global DoD / PR)

• All AC met and demonstrated — n/a, test branch
• Tests added/updated — n/a, test branch
• Code/design reviews approved — do not review
• CI green — n/a, test branch

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[eleshar]

Scratch probe for #3693, closing and deleting as planned. Purpose and observations are recorded on #3693.