Add maven metadata and signature on workflowcheck aritfacts

[mjameswh]

What was changed

• Modified the root Gradle subprojects.publishing.publications config so it applies to every MavenPublication object, not only the mavenJava target. This allows subprojects to register extra publication targets that also inherit the POM and artifact signature configuration.
• For the workflowcheck shadow (-all) publication, added the required sources and javadoc artifacts.

Why

• This resolves Sonatype validation failures seen when publishing the newly added workflowcheck module.

[Copilot]

Pull request overview

Updates the Gradle publishing setup so POM metadata and signing apply consistently to all Maven publications (including custom ones like the shadow publication), and ensures the temporal-workflowcheck shaded (“-all”) artifact meets Sonatype requirements.

Changes:

• Apply POM customization to every MavenPublication in each subproject (not just mavenJava).
• Sign every MavenPublication when signing is configured.
• Attach sourcesJar and javadocJar artifacts to the workflowcheck shadow publication.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
temporal-workflowcheck/build.gradle	Adds sources/javadoc artifacts to the shadow Maven publication for Sonatype validation.
gradle/publishing.gradle	Generalizes POM configuration and signing from mavenJava to all MavenPublication instances.

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