Add workerEmail support to BackendConfigurationPropertyWorkers page objects

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This PR adds support for the workerEmail field to the BackendConfigurationPropertyWorkers page objects to enable testing of the new required WorkerEmail attribute on selectedDeviceUser.

Changes Made

PropertyWorker Interface Updates

• Added optional workerEmail?: string; field to PropertyWorker interfaces in both e2e and Cypress versions
• Maintains backward compatibility - existing tests continue to work without the email field

New Methods Added

• createEmailInput() - Targets #workerEmail element for creation modal
• editEmailInput() - Targets #workerEmail element for edit modal
• Both methods follow the same pattern as existing input methods (firstName, lastName)

Modal Logic Updates

• Updated openCreateModal() method to set email field when propertyWorker.workerEmail is provided
• Updated openEditModal() method in PropertyWorkerRowObject to handle email during editing
• Email field is processed after surname and before language, maintaining logical flow

Consistency Across Test Frameworks

• Identical implementation in both WebDriverIO (e2e) and Cypress versions
• Same method names, same element targeting (#workerEmail), same optional behavior

Usage Example

Tests can now include email when creating workers:

const workerWithEmail = {
  name: 'John',
  surname: 'Doe',
  language: 'Dansk',
  workerEmail: '[email protected]', // New optional field
  properties: [0]
};

// This will now set the email field in the create modal
await backendConfigurationPropertyWorkersPage.create(workerWithEmail);

The implementation is fully backward compatible - tests without the workerEmail field continue to work exactly as before.

Fixes #488.

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