Short-circuit dependencies and configuration caching if cache dir already exists

This is relevant if you run this action several times in a single job.
This prevent doing unnecessary work starting with the second job using the action.
This prevent droping dependencies downloaded by the first job using the action.
This prevent Windows agents to fail unlinking already existing files.

src/cache-configuration.ts

@@ -19,6 +19,7 @@ export async function restoreCachedConfiguration(
     if (isConfigurationCacheDisabled()) return
 
     const cachePath = path.resolve(rootDir, '.gradle/configuration-cache')
+    if (fs.existsSync(cachePath)) return
     core.saveState(CONFIGURATION_CACHE_PATH, cachePath)
 
     const inputCacheExact = github.inputBoolean('configuration-cache-exact')