all: Remove ResourceServerWithMoveResourceState Checks/Assertions

[bflad]

terraform-plugin-mux version

v0.14.0 (not yet released)

Description

This issue is a corollary to hashicorp/terraform-plugin-go#363, where there will be two separate releases for MoveResourceState RPC support. When the terraform-plugin-go dependency is updated to require MoveResourceState in ResourceServer implementations, the temporary ResourceServerWithMoveResourceState checks in this codebase should be removed.

Proposal

Remove type assertions against tfprotov5.ResourceServerWithMoveResourceState and tfprotov6.ResourceServerWithMoveResourceState directly, in preference of using the updated ProviderServer directly.

References

• tfprotov5+tfprotov6: Copy MoveResourceState method into ResourceServer terraform-plugin-go#363

[github-actions]

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