Prior to this commit, the ApiDiff Gradle task would be configured for all submodules of the Spring Framework project and would assume that they all existed for the baseline version considered for the API diff. This would cause issues when: * the sub-project is not published as it's not an official "spring-*" module * the "spring-*" module is new and did not exist for the baseline version This commit ensures that only "spring-*" modules are considered for this task and that we trigger an early resolution of the baseline version - if the version doesn't exist, a warn message is logged and we assume that this is a new module, to be compared with an empty configuration. This commit also renames the "spring-core-graalvm" project to "graalvm-feature", since this sub-project is not an official module published to Maven Central, but rather an internal dependency. Fixes gh-28818
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