Change publish conditions to check for changes

[simonsabin]

Looking to fix #640

Can't test as it requires greater priviledges

[Copilot]

Pull request overview

Updates the OAuth2Client NuGet publishing GitHub Actions workflow to gate publish-related steps based on the “changes detected” check, aligning the step conditions with the workflow’s actual check_changes output so the publish path can run when OAuth2Client files change (Issue #640).

Changes:

• Switches publish-step if: conditions from a non-existent steps.calc_version.outputs.should_publish output to steps.check_changes.outputs.has_changes.
• Ensures build/pack/push/tag steps are consistently conditioned on the same “has changes” signal.

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