Improve Test Coverage for `permissionCtrl.js` (Current: 36.36%)

@Akshat453 is already working on this.

Since Jun 18, 2025.

**Description:**

The file `EvalAI/frontend/src/js/controllers/permissionCtrl.js` currently has **low test coverage**, with only **36.36%** according to the latest Codecov report. This controller includes important logic such as the ability for users to request a new email verification link, which is currently **under-tested**.

The `requestLink()` function, in particular, handles a critical piece of user interaction and should be thoroughly tested to prevent regressions and ensure a reliable user experience.

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### ✅ Focus Area: `requestLink()`

The `requestLink()` method sends a **POST** request to trigger a new email verification. It handles different response scenarios and interacts with the UI via `$rootScope.notify()`.

#### Tests to Add:

* [ ] Ensure `utilities.sendRequest()` is called with the correct:

* URL
* HTTP method (`POST`)
* Token
* [ ] Simulate **successful POST** response:

* Assert that `vm.sendMail` is set to `true`
* Assert that `$rootScope.notify()` displays a **success message**
* [ ] Simulate **400/500 error** response:

* Assert that a **generic error notification** is triggered via `$rootScope.notify()`

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### 📈 Goal

Increase test coverage of `permissionCtrl.js` to **above 90%**, with full test validation of `requestLink()`'s behavior across success and failure flows.