Exclude Forms from WP Rocket Minification / Combine

[n7studios]

Summary

Fixes this reported issue by registering the Kit hostnames to WP Rocket's rocket_minify_excluded_external_js filter, ensuring Forms are not minified by WP Rocket, resulting in them not displaying.

Testing

• testFormBlockWithWPRocketPlugin: Renamed to testFormBlockWithWPRocketPluginDelayJS, to test that the Form displays when WP Rocket is set to delay JS.
• testFormBlockWithWPRocketPluginMinifyJS: Test that the Form displays when WP Rocket is set to minify JS.
• Created helper methods to configure WP Rocket, depending on the test.

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)