Use tfversion variables instead of go-version directly for function testing (#221)

Reference: https://github.com/hashicorp/terraform-provider-scaffolding-framework/pull/220

Consuming developers should not directly need to worry about `github.com/hashicorp/go-version` unless they want to use that Go module. Provider-defined functions testing was releasing in this template repository before the Terraform 1.8.0 version variable in the terraform-plugin-testing `tfversion` package was available. Now that the variable is present, we can remove go-version as a direct dependency, simplifying both the code and dependency management slightly.

go.mod

@@ -3,7 +3,6 @@ module github.com/hashicorp/terraform-provider-scaffolding-framework
 go 1.21
 
 require (
-	github.com/hashicorp/go-version v1.6.0
 	github.com/hashicorp/terraform-plugin-docs v0.19.2
 	github.com/hashicorp/terraform-plugin-framework v1.8.0
 	github.com/hashicorp/terraform-plugin-go v0.23.0
@@ -37,6 +36,7 @@ require (
 	github.com/hashicorp/go-multierror v1.1.1 // indirect
 	github.com/hashicorp/go-plugin v1.6.0 // indirect
 	github.com/hashicorp/go-uuid v1.0.3 // indirect
+	github.com/hashicorp/go-version v1.6.0 // indirect
 	github.com/hashicorp/hc-install v0.6.4 // indirect
 	github.com/hashicorp/hcl/v2 v2.20.1 // indirect
 	github.com/hashicorp/logutils v1.0.0 // indirect

internal/provider/example_function_test.go

@@ -7,7 +7,6 @@ import (
 	"regexp"
 	"testing"
 
-	"github.com/hashicorp/go-version"
 	"github.com/hashicorp/terraform-plugin-testing/helper/resource"
 	"github.com/hashicorp/terraform-plugin-testing/tfversion"
 )
@@ -15,7 +14,7 @@ import (
 func TestExampleFunction_Known(t *testing.T) {
 	resource.UnitTest(t, resource.TestCase{
 		TerraformVersionChecks: []tfversion.TerraformVersionCheck{
-			tfversion.SkipBelow(version.Must(version.NewVersion("1.8.0"))),
+			tfversion.SkipBelow(tfversion.Version1_8_0),
 		},
 		ProtoV6ProviderFactories: testAccProtoV6ProviderFactories,
 		Steps: []resource.TestStep{
@@ -36,7 +35,7 @@ func TestExampleFunction_Known(t *testing.T) {
 func TestExampleFunction_Null(t *testing.T) {
 	resource.UnitTest(t, resource.TestCase{
 		TerraformVersionChecks: []tfversion.TerraformVersionCheck{
-			tfversion.SkipBelow(version.Must(version.NewVersion("1.8.0"))),
+			tfversion.SkipBelow(tfversion.Version1_8_0),
 		},
 		ProtoV6ProviderFactories: testAccProtoV6ProviderFactories,
 		Steps: []resource.TestStep{
@@ -56,7 +55,7 @@ func TestExampleFunction_Null(t *testing.T) {
 func TestExampleFunction_Unknown(t *testing.T) {
 	resource.UnitTest(t, resource.TestCase{
 		TerraformVersionChecks: []tfversion.TerraformVersionCheck{
-			tfversion.SkipBelow(version.Must(version.NewVersion("1.8.0"))),
+			tfversion.SkipBelow(tfversion.Version1_8_0),
 		},
 		ProtoV6ProviderFactories: testAccProtoV6ProviderFactories,
 		Steps: []resource.TestStep{