feat: Automatically trigger initialisation if cookiePolicy script is ran after DOM content has loaded

[petesfrench]

Done

• Adds a fallback to automatically trigger the init function if the cookiePolicy script is called after DOM content has loaded. I also as added a check with in the init function to see if it has already ran to avoid it being ran twice.

QA

• Check out this branch
• Build the project with npm run build
• Run the project with npm run server
• Visit the website at http://0.0.0.0:8301/
• Revoke the cookies
• Check that the cookie-policy modal opens
• Defer the cookie-policy script from running until after DOM content has loaded (you can do this by adding the defer attribute to the script tag)

[nbellol]

LGTM! Tested both cases and everything worked correctly.

[nbellol]

Looks good to me