Link Groovy javadoc through a local package-list instead of fetching it

[vharseko]

Problem

Scattered build-maven matrix cells keep failing in javadoc:jar (attach-javadocs) with

Error fetching URL: https://docs.groovy-lang.org/latest/html/api/ (java.io.FileNotFoundException: .../package-list)

The javadoc <link> to docs.groovy-lang.org/latest makes every build fetch the Groovy link list over the network. javadoc tries element-list first and falls back to package-list. The latest docs now return 404 for package-list, so a single transient miss on element-list fails the build. The same link has also been seen to hang javadoc until the 6-hour job limit. Recent examples are #130, #142 and #145, whose failed cells went green on a plain re-run.

Change

• OpenICF-java-framework/pom.xml: remove the Groovy link. None of the framework modules expose Groovy types in their public API, so the link added nothing there.
• OpenICF-java-framework/bundles-parent/pom.xml: replace both <links> blocks (pluginManagement and <reporting>) with an offlineLink. It points at a committed package-list under bundles-parent/src/javadoc/groovy-2.4.21/. The URL now targets the Groovy version the build actually uses (2.4.21) instead of latest, which currently holds the Groovy 5 docs. The connectors that expose Groovy types (groovy, ssh, kerberos) keep their cross-links.
• If the local file cannot be found, for example in the src/it invoker projects, the plugin only logs an error and skips the link. It does not fail the build.
• The file must be refreshed when the Groovy version changes. The comment next to the groovyJavadocPackageList property says so.

Verification

• package with attach-javadocs (failOnWarnings=true) on JDK 26 for connector-framework-contract, connector-framework-internal, groovy-connector, ssh-connector and kerberos-connector, plus groovy-connector on JDK 11: BUILD SUCCESS.
• The javadoc options file (-Ddebug=true) has no network -link left. Groovy is passed as -linkoffline https://docs.groovy-lang.org/2.4.21/html/api <local dir>.
• The generated HTML links to docs.groovy-lang.org/2.4.21 in 30 files for groovy-connector (e.g. groovy/lang/Closure.html, CompilerConfiguration.html), 6 for ssh and 4 for kerberos. No links to latest remain.