feat: deprecate and archive prebuilt bindings for ad provider (#269)

HashiCorp has made the decision to stop publishing new versions of
prebuilt Terraform `ad` provider bindings for
[CDK for Terraform](https://cdk.tf). Once this PR is merged, the
[cdktf/cdktf-provider-ad](https://github.com/cdktf/cdktf-provider-ad)
repository will be archived and will no longer
be supported in any way by HashiCorp. Previously-published versions of
the prebuilt `ad` provider will still continue
to be available on their respective package managers (e.g. npm, PyPi,
Maven, NuGet), but these will not be compatible with
new releases of `cdktf` and are no longer eligible for commercial
support.

Signed-off-by: team-tf-cdk <github-team-tf-cdk@hashicorp.com>

provider.json

@@ -1,6 +1,5 @@
 {
   "acme": "vancluever/acme@~> 2.10",
-  "ad": "ad@~> 0.4",
   "archive": "hashicorp/archive@~> 2.2",
   "aws": "aws@~> 5.0",
   "azuread": "hashicorp/azuread@~> 2.0",

sharded-stacks.json

@@ -48,7 +48,6 @@
         "workspaceName": "prebuilt-providers-official-new"
       },
       "providers": [
-        "ad",
         "azurestack",
         "boundary",
         "consul",