Unhelpful error messages if location is incorrect

I've been getting an odd collection of seemingly randomly alternating error messages, which seems to have been caused by an incorrect `location` setting.

I was getting a weird mix of these two errors:

`WARNING: The public access to all blobs or containers in the storage account will be disallowed by default in the future, which means default value for --allow-blob-public-access is still null but will be equivalent to false.ERROR: (StorageAccountOperationInProgress) An operation is currently performing on this storage account that requires exclusive access.Code: StorageAccountOperationInProgressMessage: An operation is currently performing on this storage account that requires exclusive access. Error: The process '/usr/bin/az' failed with exit code 1`

`Error: failed to get latest image version: request uri https://management.azure.com/subscriptions/***/providers/Microsoft.Compute/locations/UK%20South/publishers/Canonical/artifacttypes/vmimage/offers/0001-com-ubuntu-server-jammy/skus/22_04-lts/versions?$orderby=name%20desc&$top=1&api-version=2018-06-01: Error: 400`

This was with my location set to `UK South`, which is apparently incorrect. Setting my location to `uksouth` seems to have resolved the errors. I would suggest clarifying the error messages a little to make it clearer what's going on when this field is incorrect.

My Action config, based on the provided example:

```yml
- name: Build and Distribute Custom VM Image
uses: azure/build-vm-image@v0
with:
resource-group-name: 'Az-VM-Image-Test'
location: 'uksouth'
managed-identity: 'ImageBuilderManagedIdentity'
source-os-type: 'linux'
source-image-type: 'PlatformImage'
source-image: Canonical:0001-com-ubuntu-server-jammy:22_04-lts:latest
customizer-source: ${{ GITHUB.WORKSPACE }}/workflow-artifacts
customizer-script: |
sudo mkdir /buildArtifacts
sudo cp -r /tmp/ /buildArtifacts/
sh /buildArtifacts/workflow-artifacts/install-world.sh
```