Tests: Add Jest tests for JSX parser, HOCs, and post locking utilities

Add unit tests for security-critical JSX parsing functionality with structural
assertions that verify actual output values rather than just checking existence.

- jsx-parser.test.js: 35 tests covering HTML parsing, attribute conversion,
  InnerBlocks handling, script tags, and XSS vector documentation
- setup-tests.js: Extended with wp global (blockEditor, element, data) and
  acf mock (isget, applyFilters, strCamelCase, jsxNameReplacements)
- mocks/jquery.js: DOM parsing mock using DOMParser for jsx-parser tests
- jest.config.js: Added jQuery module mapping

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Author: priethor

jest.config.js

@@ -8,6 +8,7 @@ module.exports = {
 	testEnvironment: 'jsdom',
 	moduleNameMapper: {
 		'\\.(css|less|scss|sass)$': 'identity-obj-proxy',
+		'^jquery$': '<rootDir>/tests/js/mocks/jquery.js',
 	},
 	collectCoverageFrom: [
 		'assets/src/js/**/*.{js,jsx}',