🚀 [Minor]: Default to patch-level prerelease for all open PRs with important changes

[Marius Storhaug (MariusStorhaug)]

Problem

$shouldPrerelease previously required $hasPrereleaseLabel, meaning a PR had to carry the prerelease label before ReleaseType was set to 'Prerelease'. Without the label, ReleaseType = 'None', version resolution was skipped, and downstream actions (Build-PSModule v4.1+) that require a version would fail.

Change

• $shouldPrerelease now fires for any open PR with important file changes — no label required.
• $hasPrereleaseLabel, $prereleaseLabels, $prLabels and the PrereleaseLabels setting are removed (they are no longer needed for gating).
• With AutoPatching = $true (existing default), the version bump defaults to patch level automatically.

Users control the bump level with labels (major, minor), and opt out with an ignore label (NoRelease by default).

Related

• Move version calculation to a Plan job (Resolve-PSModuleVersion) so Build and Publish never calculate or mutate versions Process-PSModule#326
• 🚀 [Minor]: Plan job decides version before build so tested artifact equals published artifact (#326) Process-PSModule#342