Converge website module updates

[lipkau]

Description

• Reuse one update-<Module> branch and pull request per module, serialize updates per module, and reject stale or unrelated release tags.
• Pin every third-party action to an immutable commit and scope Pages permissions to the build and deploy jobs that need them.
• Move the AtlassianPS.Configuration submodule to the latest stable release, v0.2.10, and remove its obsolete documentation-only exception.

Motivation and Context

This converges website release updates instead of accumulating version-specific pull requests. It also closes the current Configuration documentation gap and hardens the affected workflows without adding another automation layer.

Refs AtlassianPS/AtlassianPS#13 (WP2). This does not close the umbrella issue.

After maintainer review and merge, #59 and #63 can be closed as superseded. #53 remains the separate actions/checkout v7 upgrade and should be refreshed against the pinned workflow after this change lands.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Validation

• actionlint -color (actionlint 1.7.12): passed.
• Immutable action-reference assertion across .github/workflows/*.yml: passed.
• Rolling-branch and exact-tag/stale-release guard assertions: passed; v0.2.10 was accepted and v0.2.9 after v0.2.10 was rejected.
• bash .github/scripts/check-module-submodules.sh: passed for Configuration v0.2.10, ConfluencePS v2.5.2, JiraAgilePS v0.1.1, and JiraPS v2.16.
• env BUNDLE_PATH=.tmp/vendor/bundle BUNDLE_APP_CONFIG=.tmp/bundle-config JEKYLL_ENV=production bundle exec jekyll build --baseurl "": passed; only the existing Bootstrap Sass deprecation warning was emitted.
• git diff --check: passed.
• Independent final diff review: no remaining findings.

No dependency updater, release workflow, tag, package, or deployment was dispatched.

Checklist

• My code follows the code style of this project.
• Pester tests are not applicable to this workflow/documentation repository.
• I have updated the documentation accordingly.