Improve error messaging for "Managed Images not supporting ARM64 images error"

The issue lies on the use of managed_images for the compute gallery, which is not supported for this type of CPU. This behavior has been documented by our friends at Microsoft [here](https://github.com/Azure/azure-sdk-for-go/issues/19665#issuecomment-1343773002).

By simply removing the managed imaged attributes from your build template I believe the build should work.
```
"builders": [{
"type": "azure-arm",

"client_id": "{{user `client_id`}}",
"client_secret": "{{user `client_secret`}}",
"tenant_id": "{{user `tenant_id`}}",
"subscription_id": "{{user `subscription_id`}}",
"os_type": "Linux",
"ssh_username": "rocky",
"ssh_private_key_file": "/data/jenkins/.ssh/CLOUDTRUSTQA-01102018.pem",
"disk_caching_type": "None",
"os_disk_size_gb": "20",

"shared_image_gallery": {
"subscription": "{{user `subscription_id`}}",
"resource_group": "{{user `resource_group`}}",
"gallery_name": "{{user `gallery_name`}}",
"image_name": "{{user `image_def`}}",
"image_version": "{{user `IMAGEVER`}}"
},

"shared_image_gallery_destination": {
"subscription": "{{user `subscription_id`}}",
"resource_group": "{{user `resource_group`}}",
"gallery_name": "{{user `gallery_name`}}",
"image_name": "{{user `target_image_def`}}",
"image_version": "{{user `Target_IMAGEVER`}}",
"replication_regions": ["Canada Central", "Canada East"],

"storage_account_type": "Standard_LRS"
},

"azure_tags": {
"NAME": "{{user `target_image_name`}}",
"BUSINESSUNIT": "CICD",
"BUSINESSENTITY": "CLOUDTRUST",
"OWNEREMAIL" : "DLCLOUDTRUSTINFRAOPS@INFORMATICA.COM",
"RUNNINGSCHEDULE": "00:00:23:59:1-7",
"APPLICATIONENV": "QA",
"APPLICATIONROLE": "QA",
"ALERTGROUP": "ops_team",
"SERVICENAME": "packer",
"RELEASE": "{{user `release`}}",
"POD": "NOPOD"
},

"location": "westus2",
"vm_size": "Standard_D2pds_v5"
}
],
```

@JenGoldstrich did a better job at explaining the issue [here](https://github.com/hashicorp/packer/issues/12188#issuecomment-1425945343), which can may be helpful to you in troubleshooting the error.

_Originally posted by @nywilken in https://github.com/hashicorp/packer-plugin-azure/issues/366#issuecomment-1910603418_