oci/auth: Add support for Azure China and US Gov regions

[mihaiandreiratoiu]

Description

When using the OCI authentication in azure with managed identity in usgovernment environment, the source-controller cannot get the permissions for the cloud because it defaults to the public azure cloud.

Error

error logging into ACR error exchanging token: unexpected status code 401 from exchange request,
 response body: {\"errors\":[{\"code\":\"UNAUTHORIZED\", \"message\":\"retrieving permissions failed: 
https://management.usgovcloudapi.net/subscriptions/xxx/resourceGroups/xxx/providers/Microsoft.ContainerRegistry/registries/xxx/providers/Microsoft.Authorization/permissions/?api-version=xxx\"}]}"

Fix

The fix proposes a map for each azure cloud environment that is automatically detected by the suffix of the ACR.

[darkowlzz]

The change looks good to me.
But since our azure account used in CI isn't available at the moment, I'll check for a manual run of the e2e tests. Will merge after we get test results.

Thanks.

[somtochiama]

I ran the oci integration tests for Azure locally and they passed 🥳

LGTM! Thanks @mihaiandreiratoiu 🏅

[stefanprodan]

This will be included in Flux 2.1.0 release, thanks @mihaiandreiratoiu

PS. Could you please add UiPath to Flux adopters page https://fluxcd.io/adopters/