[ResourceNameRestriction] Should enums (without "pattern") be treated as valid or invalid?

[JackTn]

Describe the bug
https://github.com/Azure/azure-rest-api-specs/pull/22978/checks?check_run_id=13024521883

The resource name parameter 'notificationName' should be defined with a 'pattern' restriction.
Location: Microsoft.ApiManagement/preview/2022-09-01-preview/apimworkspaces.json#L1828

The parameter already has restriction as defined here

https://github.com/Azure/azure-rest-api-specs/blob/e6e61df03b325344f43cdfe756c44ed58d94e409/specification/apimanagement/resource-manager/Microsoft.ApiManagement/preview/2022-09-01-preview/apimanagement.json#L467

To Reproduce
Steps to reproduce the behavior:

Expected behavior
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• Version [e.g. 22]

Additional context
Details in Azure/azure-rest-api-specs#23737

[JackTn]

@solankisamir Follow this ~

[mikeharder]

Another hit: https://github.com/Azure/azure-rest-api-specs-pr/pull/18557/checks?check_run_id=26319696623

[mikeharder]

Adding unit test to determine if this is a bug or by design: #714