@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/__tests__/__fixtures__/action.yml

@@ -1,5 +1,5 @@
 name: 'Set env variables'
 description: 'Sets certain env variables so that e2e restore and save cache can be tested in a shell'
 runs:
-  using: 'node12'
+  using: 'node20'
   main: 'index.js'