Removes support for configuration-cache extraction and restore from the
caching workflow and related source code. Configuration-cache support
only worked for a limited set of projects (gradle/actions#21), and we
plan to reimplement this properly as part of the
`gradle-actions-caching` project.
The main impact is simplification of the caching logic, focusing only on
common Gradle artifacts. The `ConfigurationCacheEntryExtractor` class
and related logic were deleted from
`sources/src/caching/gradle-home-extry-extractor.ts`.
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