Change how we load addonscript (transition from GitHub pages to Cloudflare KV) + Fix *that* console error

[boomzero]

What does this PR aim to accomplish?:

Change how we load addonscript (transition from GitHub pages to Cloudflare KV) + Fix that console error

How does this PR accomplish the above?:

Error handling improvements:

• XMOJ.user.js: Removes problematic code that keeps causing console errors.

Script loading updates:

• AddonScript.js: Added a notice indicating that the file should not be modified and is kept for backward compatibility, along with a warning to update the script.
• XMOJ.user.js: Replaced the direct fetch and evaluation of AddonScript.js with a call to RequestAPI to fetch the script, improving error handling and logging a warning if fetching fails.

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[github-actions]

Qodana for JS

It seems all right 👌

No new problems were found according to the checks applied

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[boomzero]

PS: I think it is because SendData doesn't specify a Callback