Commit pattern upgrade

[Wakeful-Cloud]

Fixes #6

Changes

• Added unit tests (Only for the new commit pattern regular expression)
• Moved commit pattern/commit regex to a new file so the action and tests will have the same source of truth
• Modified yarn.lock in potentially unhelpful ways

Disclaimer: I've never used Yarn before, so you should triple check yarn.lock because I might have messed up something.