Avoid invoking Task.project at execution time in ShadowSource

[noojung]

Currently, running the build with --warning-mode=all reports the following deprecation warning:

$ ./gradlew clean build --warning-mode all

> Task :spring-core:javapoetSource
Invocation of Task.project at execution time has been deprecated. This will fail with an error in Gradle 10. This API is incompatible with the configuration cache, which will become the only mode supported by Gradle in a future release. Consult the upgrading guide for further information: https://docs.gradle.org/9.7.1/userguide/upgrading_version_7.html#task_project

ShadowSource currently invokes Task.project at execution time — to run an ArtifactResolutionQuery for source artifacts, and to call Project.sync() and Project.zipTree(). Gradle deprecates this and will reject it in Gradle 10.

This PR injects FileSystemOperations and ArchiveOperations in place of Project, and replaces the List<Configuration> input with a ConfigurableFileCollection populated at configuration time from an ArtifactView that reselects the sources variant. That also removes the last task state that could not be serialized into the configuration cache.

Reselecting the variant requires module metadata, so javapoet and objenesis in spring-core now use transitive = false instead of the @jar artifact-only notation, which skips metadata entirely. The artifacts resolved for the repack jars are unchanged.

However, ArtifactView.ViewConfiguration#withVariantReselection() is still @Incubating in Gradle 9.7.1 and has no stable equivalent.

Reference: https://docs.gradle.org/9.7.1/userguide/upgrading_version_7.html#task_project