[MICROBA-1179] - Continue renaming/removal of code referring to the Certificate "white list". The Certificates Django app `CertificateWhitelist` model is going away in an effort to make our codebase more inclusive. It is being replaced with the `CertificateAllowlist` model. This PR continues to replace references to the Certificate "whitelist" with "allowlist" wherever possible. There should be no change in functionality, nor are there any changes in appearance.
Sass Watch: sass --watch lms/static/sass:lms/static/sass -r ./lms/static/sass/bourbon/lib/bourbon.rb