fix: enhance notifications and validation features

- Added URL validation for notification providers to ensure only valid http/https URLs are accepted.
- Implemented tests for URL validation scenarios in the Notifications component.
- Updated translations for error messages related to invalid URLs in multiple languages.
- Introduced new hooks for managing security headers and access lists in tests.
- Enhanced the ProviderForm component to reset state correctly when switching between add and edit modes.
- Improved user feedback with update indicators after saving changes to notification providers.
- Added mock implementations for new hooks in various test files to ensure consistent testing behavior.

frontend/src/pages/__tests__/Security.functional.test.tsx

@@ -17,6 +17,24 @@ import * as settingsApi from '../../api/settings'
 vi.mock('../../api/security')
 vi.mock('../../api/crowdsec')
 vi.mock('../../api/settings')
+vi.mock('../../hooks/useNotifications', () => ({
+  useSecurityNotificationSettings: vi.fn(() => ({
+    data: {
+      enabled: false,
+      min_log_level: 'warn',
+      notify_waf_blocks: true,
+      notify_acl_denials: true,
+      notify_rate_limit_hits: true,
+      webhook_url: '',
+      email_recipients: '',
+    },
+    isLoading: false,
+  })),
+  useUpdateSecurityNotificationSettings: vi.fn(() => ({
+    mutate: vi.fn(),
+    isPending: false,
+  })),
+}))
 
 // Mock i18n translation
 vi.mock('react-i18next', () => ({