added productive error when loop protection breaks in p5.strands

[kushal1061]

Resolves #8721

Changes:

• Added detection for loop-protection code (e.g. loopProtect / $OP.loopProtect) in user sketches before p5.strands transpilation.
• Loop protection breaks p5.strands shader compilation, an error is now thrown early with a clear message.
• The error instructs users to add // noprotect at the top of their sketch to disable loop protection.

Screenshots

Old error:

New error after changes:

PR Checklist

• npm run lint passes
• Inline reference is included / updated
• Unit tests are included / updated