Security Checks: Show "Insufficient access permissions" in UI for non admin users

When non admin user tries to access page which editor/viewer users cannot access, directly via URL he/she will should get "Insufficient access permissions".

This behaviour should be unified for all pages that can't be accessed by editors/viewers. Access denied notification should be removed in such cases.

How to test:

1. Login with an account with viewer/editor permissions;
2. Go through the URL to dbaas, security checks, integrated alerting or backups.
3. Check that the message "Insufficient access permissions." shows.
4. Login with an admin account.
5. Go to any of the previous pages.
6. Check that the feature shows as expected or in case it's disabled shows a message to enable the feature.