[Quantum] Remove msrestazure dependency (#8145)

* commented-out _create_role_asignment and the msrestazure import

* Deleted commented-out code

src/quantum/azext_quantum/operations/workspace.py

@@ -18,7 +18,6 @@
 from azure.cli.core.azclierror import (InvalidArgumentValueError, AzureInternalError,
                                        RequiredArgumentMissingError, ResourceNotFoundError)
 
-from msrestazure.azure_exceptions import CloudError
 from .._client_factory import cf_workspaces, cf_quotas, cf_workspace, cf_offerings, _get_data_credentials
 from ..vendored_sdks.azure_mgmt_quantum.models import QuantumWorkspace
 from ..vendored_sdks.azure_mgmt_quantum.models import QuantumWorkspaceIdentity
@@ -176,31 +175,6 @@ def _add_quantum_providers(cmd, workspace, providers, auto_accept, skip_autoadd)
         workspace.providers.append(p)
 
 
-def _create_role_assignment(cmd, quantum_workspace):
-    from azure.cli.command_modules.role.custom import create_role_assignment
-    retry_attempts = 0
-    while retry_attempts < MAX_RETRIES_ROLE_ASSIGNMENT:
-        try:
-            create_role_assignment(cmd, role="Contributor", scope=quantum_workspace.storage_account, assignee=quantum_workspace.identity.principal_id)
-            break
-        except (CloudError, AzureInternalError) as e:
-            error = str(e.args).lower()
-            if (("does not exist" in error) or ("cannot find" in error)):
-                print('.', end='', flush=True)
-                time.sleep(POLLING_TIME_DURATION)
-                retry_attempts += 1
-                continue
-            raise e
-        except Exception as x:
-            raise AzureInternalError(f"Role assignment encountered exception ({type(x).__name__}): {x}") from x
-    if retry_attempts > 0:
-        print()  # To end the line of the waiting indicators.
-    if retry_attempts == MAX_RETRIES_ROLE_ASSIGNMENT:
-        max_time_in_seconds = MAX_RETRIES_ROLE_ASSIGNMENT * POLLING_TIME_DURATION
-        raise AzureInternalError(f"Role assignment could not be added to storage account {quantum_workspace.storage_account} within {max_time_in_seconds} seconds.")
-    return quantum_workspace
-
-
 def _validate_storage_account(tier_or_kind_msg_text, tier_or_kind, supported_tiers_or_kinds):
     if tier_or_kind not in supported_tiers_or_kinds:
         tier_or_kind_list = ', '.join(supported_tiers_or_kinds)