chore: remove experiment "terraform-directory-reuse" (#21397)

Experiment is no longer required, the new method will be released without an experiment and without a toggle

Main PR is: https://github.com/coder/coder/pull/21398

codersdk/deployment.go

@@ -3850,8 +3850,6 @@ const (
 	ExperimentOAuth2             Experiment = "oauth2"               // Enables OAuth2 provider functionality.
 	ExperimentMCPServerHTTP      Experiment = "mcp-server-http"      // Enables the MCP HTTP server functionality.
 	ExperimentWorkspaceSharing   Experiment = "workspace-sharing"    // Enables updating workspace ACLs for sharing with users and groups.
-	// ExperimentTerraformWorkspace uses the "Terraform Workspaces" feature, not to be confused with Coder Workspaces.
-	ExperimentTerraformWorkspace Experiment = "terraform-directory-reuse" // Enables reuse of existing terraform directory for builds
 )
 
 func (e Experiment) DisplayName() string {
@@ -3872,8 +3870,6 @@ func (e Experiment) DisplayName() string {
 		return "MCP HTTP Server Functionality"
 	case ExperimentWorkspaceSharing:
 		return "Workspace Sharing"
-	case ExperimentTerraformWorkspace:
-		return "Terraform Directory Reuse"
 	default:
 		// Split on hyphen and convert to title case
 		// e.g. "web-push" -> "Web Push", "mcp-server-http" -> "Mcp Server Http"

codersdk/templates.go

@@ -63,8 +63,7 @@ type Template struct {
 	MaxPortShareLevel    WorkspaceAgentPortShareLevel `json:"max_port_share_level"`
 	CORSBehavior         CORSBehavior                 `json:"cors_behavior"`
 
-	UseClassicParameterFlow    bool `json:"use_classic_parameter_flow"`
-	UseTerraformWorkspaceCache bool `json:"use_terraform_workspace_cache"`
+	UseClassicParameterFlow bool `json:"use_classic_parameter_flow"`
 }
 
 // WeekdaysToBitmap converts a list of weekdays to a bitmap in accordance with
@@ -264,11 +263,6 @@ type UpdateTemplateMeta struct {
 	// made the default.
 	// An "opt-out" is present in case the new feature breaks some existing templates.
 	UseClassicParameterFlow *bool `json:"use_classic_parameter_flow,omitempty"`
-	// UseTerraformWorkspaceCache allows optionally specifying whether to use cached
-	// terraform directories for workspaces created from this template. This field
-	// only applies when the correct experiment is enabled. This field is subject to
-	// being removed in the future.
-	UseTerraformWorkspaceCache *bool `json:"use_terraform_workspace_cache,omitempty"`
 }
 
 type TemplateExample struct {