Fix check_membership test failures from missing error_helpers mock

[Copilot]

PR #8000 added require("./error_helpers.cjs") to check_permissions_utils.cjs, breaking tests that use custom module mocking via new Function() evaluation.

Changes

• Added afterEach import to vitest imports (was used but not imported)
• Extended mockRequire function to handle error_helpers.cjs module
• Propagated mockRequire to check_permissions_utils.cjs execution context

// Now handles the error helpers dependency chain
const mockRequire = modulePath => {
  if (modulePath === "./error_helpers.cjs") {
    const errorHelpersFunction = new Function("module", "exports", errorHelpersContent);
    // ... execute and return exports
  }
  if (modulePath === "./check_permissions_utils.cjs") {
    // Pass mockRequire so utils can resolve error_helpers
    const utilsFunction = new Function("core", "github", "context", "process", "module", "exports", "require", utilsContent);
    utilsFunction(mockCore, mockGithub, mockContext, process, mockModule, moduleExports, mockRequire);
  }
};

Fixes 15 failing tests in check_membership.test.cjs.

Original prompt

Reference: https://github.com/githubnext/gh-aw/actions/runs/20561124903/job/59051883350#step:6:1

Fix JS tests

Custom agent used: ci-cleaner
Tidies up the repository CI state by formatting sources, running linters, fixing issues, running tests, and recompiling workflows

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