@actions/cache: convert to an ESM module (#2275)

* `@actions/cache`: convert to an ESM module

* Update the fixture to ESM syntax

* Update the cache workflows

* Bump `@actions/glob` to `0.6.1`

* Fix awaiting in the cache unit tests

* Fix a type issues in contracts

* Export the `DownloadOptions`/`UploadOptions` like before

* More cache test fixes

* Make the cache units tests better

* Add some more logging

* Add retries to restore-cache.mjs

packages/cache/src/internal/cacheUtils.ts

@@ -11,7 +11,7 @@ import {
   CacheFilename,
   CompressionMethod,
   GnuTarPathOnWindows
-} from './constants'
+} from './constants.js'
 
 const versionSalt = '1.0'