[redisenterprise] az redisenterprise database access-policy-assignment delete rejects portal-created assignment names

Source: https://github.com/Azure/azure-cli/issues/33444 (by @shraboin)
Affected extension: `redisenterprise` (`src/redisenterprise/`)

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# Issue #33444 (by @shraboin)
## Title
az redisenterprise database access-policy-assignment delete rejects portal-created assignment names

## Body
### Describe the bug

**Issue**: unable to delete access policy using Azure CLI. Particularly Azure CLI is not deleting the access policies that were created through Azure portal.

The Azure CLI redisenterprise extension (v1.4.0) applies a client-side regex validation (^[A-Za-z0-9]{1,60}$) on the
--access-policy-assignment-name parameter that rejects GUID-format names containing hyphens. Access policy
assignments created through the Azure portal use GUID names (e.g., 76e670c5-eaf4-4674-8a48-2def9d37929c), making
them impossible to delete via CLI.

**Steps To Reproduce**

1. Create an AMR (Azure Managed Redis) instance
2. Create an access policy assignment via the Azure portal (generates a GUID name)
3. List assignments: az redisenterprise database access-policy-assignment list \
--resource-group --cluster-name --database-name default
4. Attempt to delete: az redisenterprise database access-policy-assignment delete \
--resource-group --cluster-name --database-name default \
--access-policy-assignment-name "76e670c5-eaf4-4674-8a48-2def9d37929c" --yes

Expected Behavior

The DELETE request is sent to ARM and the assignment is removed.

Actual Behavior

ERROR: InvalidArgumentValue: -n: Invalid format: '76e670c5-eaf4-4674-8a48-2def9d37929c'
does not fully match regular expression pattern '^[A-Za-z0-9]{1,60}$'

The request never reaches ARM — it is blocked by client-side input validation.

Root Cause (did not validate from CoPilot but seems right)

The validation happens in the CLI's argument formatter (_arg_fmt.py) before any HTTP request is made to ARM. The
request never reaches the server — it's a client-side regex that rejects hyphens.

The regex in the extension's argument formatter (
azext_redisenterprise/aaz/latest/redisenterprise/database/access_policy_assignment/_delete.py) does not permit
hyphens. The pattern should be updated to accept GUID-format names, e.g.:

^[A-Za-z0-9-]{1,60}$

or a full UUID pattern:

^[0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{12}$

Workaround

Use PowerShell:

Remove-AzRedisEnterpriseCacheAccessPolicyAssignment `
-ResourceGroupName -ClusterName -DatabaseName default `
-AccessPolicyAssignmentName "76e670c5-eaf4-4674-8a48-2def9d37929c"

Environment

- CLI version: Azure CLI with redisenterprise extension v1.4.0
- PowerShell module: Az.RedisEnterpriseCache v1.6.1 (works correctly)
- ARM API version: 2025-07-01
- OS: Windows

### Related command

see description

### Errors

File: azure/cli/core/aaz/_arg_fmt.py, line 56
AAZInvalidArgValueError: InvalidArgumentValue: -n: Invalid format:
'76e670c5-eaf4-4674-8a48-2def9d37929c' does not fully match regular
expression pattern '^[A-Za-z0-9]{1,60}$'

. Further details on the fix are in bug report but gist is regex for cli needs updating to accept hyphen

### Issue script & Debug output

see description

### Expected behavior

See description

### Environment Summary

Environment

CLI version: Azure CLI with redisenterprise extension v1.4.0
PowerShell module: Az.RedisEnterpriseCache v1.6.1 (works correctly)
ARM API version: 2025-07-01
OS: Windows

### Additional context

none

## Comments
### Comment by @yonzhan

Thank you for opening this issue, we will look into it.
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