echoprovider: Fix bug where Terraform v1.12.1 would return an error indicating GetResourceIdentitySchemas was not implemented

[austinvalle]

Related Issue

Ref:

• all: Remove temporary ProviderServerWithResourceIdentity interface terraform-plugin-go#516
• Update terraform-plugin-go and add changelogs for v0.20.0 release terraform-plugin-mux#307

Description

Previously, the echoprovider did not implement GetResourceIdentitySchemas despite being upgraded to [email protected], however that is required as of Terraform v1.12.1

=== NAME  TestSchemaEphemeralResource_ObjectAttribute
    schema_ephemeral_resource_test.go:691: Step 1/1 error: Error running pre-apply plan: exit status 1
        
        Error: Failed to load plugin schemas
        
        Error while loading schemas for plugin components: Failed to obtain provider
        schema: Could not load the schema for provider
        registry.terraform.io/hashicorp/echo: failed to retrieve schema from provider
        "registry.terraform.io/hashicorp/echo": Provider GetResourceIdentitySchemas
        Not Implemented: A GetResourceIdentitySchemas call was received by the
        provider, however the provider does not implement the call. Either upgrade
        the provider to a version that implements resource identity support or this
        is a bug in Terraform that should be reported to the Terraform maintainers...

Rollback Plan

• If a change needs to be reverted, we will roll out an update to the code within 7 days.

Changes to Security Controls

N/A

[austinvalle]

I put this in v1.14.0 because we will need to upgrade our version of terraform-plugin-go, however we probably could just remove the plugin-go upgrade and do a v1.13.1? 🤔