* Move application configuration to be loaded from environment variables
* Remove unused sentry.properties
* Make missing value sentinel a constant and ignore all *.env files
* Removed now-used ACL properties
* Prefix RapidAPI environment variable with APPSMITH_
* Fix application properties not being loaded into static fields
* Remove application-test.properties file
* Add required env variables for test in GitHub
* Quote URLs for MongoDB and Redis in test config
* Change RAPIDAPI to RAPID_API in environment variable names
* Source .env file in the root of repo in start script
