Set up full input testing (#150)

* Extract main loop to something testable

* Revert "Extract main loop to something testable"

This reverts commit 35a78459698fe267933c554283212c2d06ed4bf0.

* Extract code that interacts with Google Play
We can now test our input flow as a whole

* Create some basic tests for `completed` status publishing

* Fix applying inputs
We don't want to be keeping values between runs

* Drop some redundant tests

* Create basic tests for draft rollout

* Run build

* Fix userFraction bug

* Improve readability of initialising inputs

* Fix runUpload mocking

* Migrate to github-action-ts-run-api

package.json

@@ -32,6 +32,7 @@
     "@typescript-eslint/parser": "^5.36.2",
     "@vercel/ncc": "^0.34.0",
     "eslint": "^8.23.0",
+    "github-action-ts-run-api": "^2.2.2",
     "jest": "^29.0.3",
     "ts-jest": "^29.0.0",
     "typescript": "^4.8.3"