refactor: migrate to plugin sdkv2 helper/id and helper/retry packages

[ocobles]

Previous step to migrate testing functionality from github.com/hashicorp/terraform-plugin-sdk/v2/helper/resource to github.com/hashicorp/terraform-plugin-testing/v2/helper/resource required to add e2e tests to migrate from SDKv2 to Framework #406 (comment)

Almost all resource.StateChangeConf references had already been previously migrated to retry.StateChangeConf

https://developer.hashicorp.com/terraform/plugin/testing/migrating

[codecov-commenter]

Codecov Report

Attention: 710 lines in your changes are missing coverage. Please review.

Comparison is base (26b2f3d) 60.11% compared to head (7e43bd1) 59.21%.
Report is 131 commits behind head on main.

Files	Patch %	Lines
internal/errors/errors.go	7.58%	134 Missing ⚠️
equinix/fabric_mapping_helper.go	0.00%	69 Missing ⚠️
equinix/resource_fabric_connection.go	0.00%	54 Missing ⚠️
equinix/resource_fabric_cloud_router.go	0.00%	46 Missing ⚠️
equinix/resource_network_device.go	2.50%	39 Missing ⚠️
equinix/resource_fabric_routing_protocol.go	0.00%	26 Missing ⚠️
equinix/resource_fabric_service_profile.go	0.00%	26 Missing ⚠️
internal/resources/metal/metal_ssh_key/resource.go	73.62%	19 Missing and 5 partials ⚠️
equinix/resource_metal_device.go	74.71%	18 Missing and 4 partials ⚠️
equinix/resource_metal_virtual_circuit.go	50.00%	13 Missing and 2 partials ⚠️
... and 44 more

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #524      +/-   ##
==========================================
- Coverage   60.11%   59.21%   -0.91%     
==========================================
  Files          99       96       -3     
  Lines       20045    19842     -203     
==========================================
- Hits        12051    11749     -302     
- Misses       7691     7802     +111     
+ Partials      303      291      -12     

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[ctreatma]

Since this is touching some Fabric things, I think we should get eyes on it from someone in @equinix/governor-digin-fabric if only to spread awareness of the change.