Remove prepended Cloudflare string from JS script type

[n7studios]

Summary

Fixes this reported issue by ensuring JS type attributes prepended with Cloudflare's randomized string are converted to text/javascript.

We removed rocket-loader.min.js in this PR, as it was breaking redirects on Landing Pages. The side effect of this is JS isn't executing on Landing Pages, as scripts still retained e.g. type="d4d618933d20ff16d2d8ebb4-text/javascript".

Testing

• Updated tests to check that script types have their prepended random string removed.

Checklist

• I have written a test and included it in this PR
• I have run all tests and they pass
• The code passes when running the PHP CodeSniffer
• Code meets WordPress Coding Standards for PHP, HTML, CSS and JS
• Security and Sanitization requirements have been followed
• I have assigned a reviewer or two to review this PR (if you're not sure who to assign, we can do this step for you)