Add a build timestamp to the userscript

[AJGranowski]

The userscript should include a timestamp of when it was built, similar to the timestamp embedded in the signature file.

Timestamp: Mon Jan 29 04:41:54 UTC 2024

Describe the solution you'd like
Add a timestamp comment for the time the script was built in the release userscript. This comment should be directly below the ==/UserScript== block. The timestamp should be in UTC, and should be human readable.

Examples:

// Build timestamp: Sat Feb 10 05:55:00 AM UTC 2024
// Build timestamp: 2024-02-10T05:55:00Z

Additional context
See the wiki for getting started.

These might also help:

• Date.prototype.toISOString()
• Terser preamble