feat: preserve html entities in proxy console

[AdityaSingh-18]

Checklist:

• I have read freeCodeCamp's contribution guidelines.
• My pull request has a descriptive title (not a vague title like Update index.md)

Closes #63788

Double-encode HTML entities in proxy-console before the string reaches sanitizeHtml. For example & becomes & and sanitizeHtml then decodes it back to & which the browser renders as the literal text &.

Babel/system errors go through window.onerror and bypass proxy-console entirely, so they are unaffected by this change.

To verify the fix locally, the built output was manually patched in the freeCodeCamp dev environment using a Python script that replaced the relevant line in the bundled javascript-test-evaluator.js files:

client/static/js/test-runner/8.0.0/javascript-test-evaluator.js
client/public/js/test-runner/8.0.0/javascript-test-evaluator.js
tools/client-plugins/browser-scripts/dist/js/test-runner/8.0.0/javascript-test-evaluator.js

The patch replaced:

const n=t.map((e=>this.#o(e))).join(" ");this.#r.push({level:e,msg:n})

With:

const n=t.map((e=>this.#o(e))).join(" ").replace(/&(amp|lt|gt|quot|apos)(;?)/g,"&$1$2");this.#r.push({level:e,msg:n})

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