[MNG-7888] maven releases do not resolve URL in pom

**[Henning Schmiedehausen](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=henning)** opened **[MNG-7888](https://issues.apache.org/jira/browse/MNG-7888?redirect=false)** and commented

The released poms contain `https://github.com/apache/maven-javadoc-plugin/tree/${project.scm.tag}`. As a result, tools that do not actively parse and resolve the pom can't display a valid URL but only show a link with the placeholder.

E.g. https://search.maven.org/artifact/org.apache.maven.plugins/maven-javadoc-plugin/3.4.1/maven-plugin

This seems to be a fundamental problem with the maven parent pom.

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No further details from [MNG-7888](https://issues.apache.org/jira/browse/MNG-7888?redirect=false)

No repository file, test, or entry point is named. Start by locating the Maven parent POM and the release configuration that produces the published POM, then compare it with the maven-javadoc-plugin 3.4.1 artifact cited in the issue. Done means released POM URLs no longer contain the ${project.scm.tag} placeholder for tools that do not resolve it.

Written by the indexing model from the issue text.