[BUG] Support diacritical marks for resource group names

### API Spec link

https://github.com/Azure/azure-rest-api-specs/blob/main/specification/web/resource-manager/Microsoft.Web/stable/2023-01-01/WebApps.json

### API Spec version

2023-01-01

### Describe the bug

Support diactrical marks, as it's supported, at least in the swedish regions (a-la `swedencentral`)

I'm using the Microsoft.Web as an example, but this is an sdk-wide issue w/ the `resourceGroupNameParameter` validation regex pattern, currently set to: `^[-\w\._\(\)]+[^\.]$`

### Expected behavior

Support diactrical marks, as it's supported, at least in the swedish regions (a-la `swedencentral`)

### Actual behavior

```
web.AppsClient#Get: Invalid input: autorest/validation:
validation failed:
parameter=resourceGroupName constraint=Pattern value="testötest" details:
value doesn't match pattern ^[-\w\._\(\)]+[^\.]$
```

### Reproduction Steps

Create a resource group with diactrical marks from the portal, try to retrieve it with any generated sdk.

### Environment

- import path of package in question: `github.com/Azure/azure-sdk-for-go/profiles/latest/web/mgmt/web`
- SDK version: `v68.0.0`
- Specify the exact commit: `2187aca40bbf6931ffac666977e5d29128d82585`
- output of `go version`: `go version go1.21.3 darwin/arm64`