P1 follow-up: fix m2e gmavenplus goal names and javadoc doclint

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Summary

Follow-up to the merged P1 build/plugin upgrade (#5), addressing two in-scope build-config items raised by automated review. Part of the automated Broadleaf Commerce Java 21 migration. Scoped to root pom.xml only; no source/Spring/Hibernate/javax→jakarta work.

Both changes verified on JDK 21: mvn -N help:effective-pom -Pblc-development,javadocs and mvn validate -Pblc-development both succeed.

Changes

• Eclipse m2e lifecycle-mapping goal names. The gmavenplus execution goals were renamed to the 3.x names in P1: Upgrade Maven build/plugin layer to Java 21 #5 (testCompile→compileTests, testGenerateStubs→generateTestStubs), but the m2e lifecycle-mapping filter still listed the old names, so the renamed goals would no longer be matched by the IDE ignore filter (Eclipse "Plugin execution not covered by lifecycle configuration"). Updated the filter goal list to the 3.x names. Editor-only config; no effect on the Maven CLI build.
• javadoc doclint. maven-javadoc-plugin was bumped to 3.7.0 in P1: Upgrade Maven build/plugin layer to Java 21 #5, which ignores the deprecated <additionalparam>-Xdoclint:none</additionalparam> property used by the disable-java8-doclint profile — so doclint would no longer actually be disabled under JDK 21 in the (opt-in) javadocs profile. Added <doclint>none</doclint> to the maven-javadoc-plugin configuration, the 3.x-supported equivalent.

Review items intentionally not addressed here (out of P1 scope)

• Spock 1.0-groovy-2.3 incompatibility with Groovy 4 and the spock-spring org.codehaus.groovy exclusion belong to the Spock/Groovy test-migration phase (Spock 1.0 still resolves the old groupId today, so the exclusion is correct as-is).
• Spring 4.1 / Hibernate 4.1 runtime compatibility with JDK 21 belongs to the framework-upgrade phase.

Link to Devin session: https://partner-workshops.devinenterprise.com/sessions/e6da6fecd09545e19497677ea1fa54f4
Requested by: @mbatchelor81

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✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no bugs or issues to report.