refactor(oss-licenses): replace eager dependency resolution with lazy ArtifactView providers

[timothyfroehlich]

Summary

Replaces the DependencyUtil helper and ArtifactFiles wrapper with lazy Provider-based artifact resolution directly in OssLicensesPlugin. This ensures dependency resolution happens at task execution time rather than during configuration, which is required for Configuration Cache compatibility and avoids slowing down Android Studio sync.

Key changes

• Use ArtifactView.resolvedArtifacts (returns Provider) instead of eagerly iterating configuration.incoming.artifacts
• Split the single @Nested MapProperty<String, ArtifactFiles> into two @Internal MapProperty<String, File> properties (libraryFilesByGav, pomFilesByGav) to avoid expensive redundant hashing of immutable Maven artifacts
• Extract DependencyHandler into a local variable before entering lazy closures to avoid capturing the non-serializable Project object
• Move ABSENT_ARTIFACT constant from deleted DependencyUtil to DependencyTask where it is used
• Delete ArtifactFiles, DependencyUtil, and DependencyResolutionTest (coverage provided by existing EndToEnd integration tests)
• Add assertion to testConfigurationCache that fails if dependencies are resolved during configuration time, catching any regression

Result

• Net -167 lines
• All 52 tests pass (6 AGP versions × 5 test methods + unit tests)
• Configuration cache, build cache relocatability, and complex dependency graph tests all green

[timothyfroehlich]

@liutikas I did a full rewrite to get things right and managed to significantly simplify things in the process. The Licenses task now separate arguments consisting of the runtimeConfiguration's resolvedArtifacts provider, with artifact resolution happening within the .map lambda. I also added a check in the configuration cache test to make sure we aren't resolving anything during configuration time.

I did use Gemini to help me get it straight, and had it add comments to help me (or other maintainers) remember for next time. I'm running an extra --scan now to double check things, but it should be pretty clean.

[liutikas]

I'm out of office for a week. I'll review this when I get back