Fix role error in provisioning startup

[byewokko]

Issue

When service starts in provisioning mode:

12-Nov-2024 11:09:25.732780 ERROR asab.application Error during service initialization
Traceback (most recent call last):
  File "/usr/lib/python3.11/site-packages/asab/application.py", line 730, in _ensure_initialization
    await service.initialize(self)
  File "/app/seacat-auth/seacatauth/provisioning/service.py", line 101, in initialize
    await self.RoleService.create(self.SuperroleID)
  File "/app/seacat-auth/seacatauth/authz/role/service.py", line 236, in create
    self.validate_superuser_access()
  File "/app/seacat-auth/seacatauth/authz/role/service.py", line 298, in validate_superuser_access
    raise exceptions.AccessDeniedError(
seacatauth.exceptions.AccessDeniedError: Not authorized to access 'authz:superuser'.

Solution

Remove duplicate superuser role initialization - it is already handled by RoleService.