Extract caching logic into a separate gradle-actions-caching component (#885)

With this change, the caching functionality of `setup-gradle` and
`dependency-submission` is now provided by `gradle-actions-caching`, a
closed-source library distributed under our [Terms of
Use](https://gradle.com/legal/terms-of-use/). The rest of the action
implementation remains open source.

Using `setup-gradle` or `dependency-submission` with caching enabled
involves loading and using the `gradle-actions-caching` component,
requiring acceptance of the [Terms of
Use](https://gradle.com/legal/terms-of-use/). There are no functional
changes to caching provided by these actions: all workflows will
continue to function as before.

The non-caching aspects of action implementation remain open source. By
running these actions with caching disabled they can be used without
ever loading `gradle-actions-caching` or accepting the license terms.

Supporting the caching infrastructure in this project requires a
substantial engineering investment by Gradle Technologies, which we can
sustain thanks to Develocity, our commercial offering. Caching
technologies are a core part of the Develocity offering, and the caching
in `setup-gradle` fits squarely in that space.

This licensing change lets us continue to build advanced capabilities
that go beyond what we would offer as open source. Proper
production-ready Configuration Cache support will be the first
capability. Improving build performance for self-hosted runners will
follow.

We may introduce functionality restrictions in future updates. However,
caching functionality will remain free for public repositories.
We have a long-standing commitment to open source, as maintainers of
Gradle Build Tool, and by [sponsoring the open source
community](https://gradle.com/oss-sponsored-by-develocity/) with free
Develocity licenses. Public repositories are primarily used by open
source projects, and we remain committed to supporting them.

- Implementation of caching logic to save and restore Gradle User Home
content has been removed, replaced by the `gradle-actions-caching`
component.
- The `@actions/caching` library is still used to cache Gradle
distributions that are downloaded and provisioned by `setup-gradle`.
This PR updates to the latest version of `@actions/caching`, and removes
the patch that is no longer required.
- License notices are now displayed in documentation, logs and the
generated Job Summary.

sources/src/build-results.ts

@@ -1,6 +1,5 @@
 import * as fs from 'fs'
 import * as path from 'path'
-import {versionIsAtLeast} from './execution/gradle'
 
 export interface BuildResult {
     get rootProjectName(): string
@@ -14,47 +13,14 @@ export interface BuildResult {
     get buildScanFailed(): boolean
 }
 
-export class BuildResults {
-    results: BuildResult[]
-
-    constructor(results: BuildResult[]) {
-        this.results = results
-    }
-
-    anyFailed(): boolean {
-        return this.results.some(result => result.buildFailed)
-    }
-
-    anyConfigCacheHit(): boolean {
-        return this.results.some(result => result.configCacheHit)
-    }
-
-    uniqueGradleHomes(): string[] {
-        const allHomes = this.results.map(buildResult => buildResult.gradleHomeDir)
-        return Array.from(new Set(allHomes))
-    }
-
-    highestGradleVersion(): string | null {
-        if (this.results.length === 0) {
-            return null
-        }
-        return this.results
-            .map(result => result.gradleVersion)
-            .reduce((maxVersion: string, currentVersion: string) => {
-                if (!maxVersion) return currentVersion
-                return versionIsAtLeast(currentVersion, maxVersion) ? currentVersion : maxVersion
-            })
-    }
-}
-
-export function loadBuildResults(): BuildResults {
+export function loadBuildResults(): BuildResult[] {
     const results = getUnprocessedResults().map(filePath => {
         const content = fs.readFileSync(filePath, 'utf8')
         const buildResult = JSON.parse(content) as BuildResult
         addScanResults(filePath, buildResult)
         return buildResult
     })
-    return new BuildResults(results)
+    return results
 }
 
 export function markBuildResultsProcessed(): void {