all: Remove FunctionServer Checks

[bflad]

terraform-plugin-mux version

v0.13.0 (not yet released)

Description

This issue is a corollary to hashicorp/terraform-plugin-go#353, where there will be two separate releases for provider defined function support. When the terraform-plugin-go dependency is updated to require FunctionServer in ProviderServer implementations, the temporary FunctionServer checks in this codebase should be removed.

Proposal

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

References

• tfprotov5+tfprotov6: Add FunctionServer to ProviderServer interface terraform-plugin-go#353

[github-actions]

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