Update ACI API version to 2021-10-01

[magodo]

This PR updates ACI API version to 2021-10-01.

There is a breaking change in this update: the network profile was removed beginning in API version 2021-07-01 and is a breaking change. With the newer API versions, customers can now specify their subnet ID directly instead of creating the network profile as an intermediary for holding the subnet ID. The new usage satisfies VNET consistency requirements across Azure. This deprecation is also mentioned in the Azure document: https://docs.microsoft.com/en-us/azure/container-instances/container-instances-vnet.

In short, customers using network profiles can continue to use API version 2021-03-01 and below with full support for network profiles. For later versions, customers should use the new subnet ID property.

NOTE: Though the subnetIds is a list of subnetIds, while currently the service only support one subnetId.

Test

💤  TF_ACC=1 go test -v -timeout=20h ./internal/services/containers  -run='TestAccContainerGroup_virtualNetwork$|TestAccContainerGroup_UserAssignedIdentityWithVirtualNetwork$|TestAccContainerGroup_SystemAssignedIdentityVirtualNetwork$|TestAccContainerGroup_virtualNetworkParallel'
=== RUN   TestAccContainerGroup_UserAssignedIdentityWithVirtualNetwork
=== PAUSE TestAccContainerGroup_UserAssignedIdentityWithVirtualNetwork
=== RUN   TestAccContainerGroup_virtualNetwork
=== PAUSE TestAccContainerGroup_virtualNetwork
=== RUN   TestAccContainerGroup_virtualNetworkParallel
=== PAUSE TestAccContainerGroup_virtualNetworkParallel
=== RUN   TestAccContainerGroup_SystemAssignedIdentityVirtualNetwork
=== PAUSE TestAccContainerGroup_SystemAssignedIdentityVirtualNetwork
=== CONT  TestAccContainerGroup_UserAssignedIdentityWithVirtualNetwork
=== CONT  TestAccContainerGroup_virtualNetworkParallel
=== CONT  TestAccContainerGroup_SystemAssignedIdentityVirtualNetwork
=== CONT  TestAccContainerGroup_virtualNetwork
--- PASS: TestAccContainerGroup_virtualNetwork (248.54s)
--- PASS: TestAccContainerGroup_SystemAssignedIdentityVirtualNetwork (335.74s)
--- PASS: TestAccContainerGroup_virtualNetworkParallel (542.01s)
--- PASS: TestAccContainerGroup_UserAssignedIdentityWithVirtualNetwork (1705.13s)
PASS
ok      github.com/hashicorp/terraform-provider-azurerm/internal/services/containers    1705.147s

[dkuzmenok]

@magodo I've had a PR to cover ACI upgrade (#17785). I guess this PR would be preferred, so it would be great if you could include new fields, added in later API versions.

[magodo]

@dkuzmenok Oh, didn't notice that. My plan was to upgrade the API version first, then add up the new properties.

[magodo]

Close this in favor of #17785

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