chore: update package.json scripts for gn build and automated releases (#14612)

* Removes un-used and non-functional code coverage helpers
* Removes un-used release script aliases
* Moves TLS to a lib folder for cleaner directory structure
* Implements start.py as start.js for the GN build
* Adds a re-usable getElectronExec helper for future scripts
* Refactors spec runner to use the helper

script/tls.py

@@ -13,7 +13,7 @@ ctx.verify_mode = ssl.CERT_NONE
 
 def check_tls(verbose):
   process = subprocess.Popen(
-    'node tls.js',
+    'node lib/tls',
     cwd=os.path.dirname(os.path.realpath(__file__)),
     shell=True,
     stdout=subprocess.PIPE,