Automate release (#10827)

* Create prepare-release script

* Add script to merge release

* Cleanup/add logging

* Move release process out of upload.py

* Add cleanup release branch

* Update release doc to reflect new scripts

* Fix to allow running with notesOnly

Also fixup release name and body when beta release.

* Fix issues found during release

* Use getRelease instead of getAssets

github.repos.getAssets is limited to 30 entries which means we may not get back the file we are looking for.

* Documentation corrections

script/publish-to-npm.js

@@ -114,7 +114,7 @@ new Promise((resolve, reject) => {
       cwd: tempDir
     })
     const checkVersion = childProcess.execSync(`${path.join(tempDir, 'node_modules', '.bin', 'electron')} -v`)
-    assert.strictEqual(checkVersion.toString().trim(), `v${rootPackageJson.version}`)
+    assert.ok((`v${rootPackageJson.version}`.indexOf(checkVersion.toString().trim()) === 0), `Version is correct`)
     resolve(tarballPath)
   })
 })