Unconsistent region for service tags API

Hello,

In the [service tags API](https://learn.microsoft.com/en-us/rest/api/virtualnetwork/service-tags/list?tabs=HTTP#uri-parameters), the `region` attribute does not have a consistent value compared to the other Azure tools.

Here's a non exhaustive list:
* France Central is `centralfrance`
* France South is `southfrance`
* BrazilSoutheast is `brazilse`
* GermanyNorth is `germanyn`
...

The value is region should be eaither the full name (aka "France Central"), the sort name (aka frc) or the normalized name (aka francecentral). The last one would make sense in my opinion.

Here's a subset of the API response with the issue
```{
"changeNumber": "114",
"cloud": "Public",
"id": "/subscriptions/513f7e88-cb3c-4e80-a6bb-b3a4984cfa6a/providers/Microsoft.Network/serviceTags/Public",
"name": "Public",
"nextLink": "",
"type": "Microsoft.Network/serviceTags",
"values": [

...

{
"id": "ApiManagement.EastUS",
"name": "ApiManagement.EastUS",
"properties": {
"addressPrefixes": [
"20.88.154.20/31",
"40.71.10.204/31",
"40.71.13.128/28",
"52.224.186.99/32",
"2603:1030:210:402::140/124"
],
"changeNumber": "3",
"networkFeatures": [
"API",
"NSG",
"UDR",
"FW"
],
"region": "eastus",
"state": "GA",
"systemService": "AzureApiManagement"
},
"serviceTagChangeNumber": "114"
},
{
"id": "ApiManagement.EastUS2",
"name": "ApiManagement.EastUS2",
"properties": {
"addressPrefixes": [
"20.44.72.3/32",
"20.62.63.254/31",
"40.70.146.76/31",
"40.70.148.16/28",
"2603:1030:40c:402::140/124"
],
"changeNumber": "3",
"networkFeatures": [
"API",
"NSG",
"UDR",
"FW"
],
"region": "eastus2",
"state": "GA",
"systemService": "AzureApiManagement"
},
"serviceTagChangeNumber": "114"
},
{
"id": "ApiManagement.EastUS2EUAP",
"name": "ApiManagement.EastUS2EUAP",
"properties": {
"addressPrefixes": [
"20.47.232.184/31",
"40.74.146.80/31",
"40.74.147.32/28",
"52.253.229.253/32",
"2603:1030:40b:400::940/124"
],
"changeNumber": "3",
"networkFeatures": [
"API",
"NSG",
"UDR",
"FW"
],
"region": "eastus2euap",
"state": "GA",
"systemService": "AzureApiManagement"
},
"serviceTagChangeNumber": "114"
},
{
"id": "ApiManagement.FranceCentral",
"name": "ApiManagement.FranceCentral",
"properties": {
"addressPrefixes": [
"40.66.60.111/32",
"40.79.130.44/31",
"40.79.131.192/28",
"51.138.215.124/31",
"2603:1020:805:402::140/124"
],
"changeNumber": "3",
"networkFeatures": [
"API",
"NSG",
"UDR",
"FW"
],
"region": "centralfrance",
"state": "GA",
"systemService": "AzureApiManagement"
},
"serviceTagChangeNumber": "114"
},
{
"id": "ApiManagement.FranceSouth",
"name": "ApiManagement.FranceSouth",
"properties": {
"addressPrefixes": [
"20.39.80.2/32",
"40.79.178.68/31",
"40.79.179.192/28",
"2603:1020:905:402::140/124"
],
"changeNumber": "2",
"networkFeatures": [
"API",
"NSG",
"UDR",
"FW"
],
"region": "southfrance",
"state": "GA",
"systemService": "AzureApiManagement"
},
"serviceTagChangeNumber": "114"
},
{
"id": "ApiManagement.GermanyNorth",
"name": "ApiManagement.GermanyNorth",
"properties": {
"addressPrefixes": [
"51.116.0.0/32",
"51.116.59.0/28",
"2603:1020:d04:402::140/124"
],
"changeNumber": "2",
"networkFeatures": [
"API",
"NSG",
"UDR",
"FW"
],
"region": "germanyn",
"state": "GA",
"systemService": "AzureApiManagement"
},
"serviceTagChangeNumber": "114"
},
{
"id": "ApiManagement.GermanyWestCentral",
"name": "ApiManagement.GermanyWestCentral",
"properties": {
"addressPrefixes": [
"20.52.94.112/31",
"51.116.96.0/32",
"51.116.155.64/28",
"2603:1020:c04:402::140/124"
],
"changeNumber": "3",
"networkFeatures": [
"API",
"NSG",
"UDR",
"FW"
],
"region": "germanywc",
"state": "GA",
"systemService": "AzureApiManagement"
},
"serviceTagChangeNumber": "114"
},

...

]
}

Start by reviewing the linked Azure service tags API documentation and the repository specification for that API. Compare the documented region values with the response examples, then confirm the expected naming convention and verify that all affected regions use it consistently.

Written by the indexing model from the issue text.