chore: remove multi-organization and custom role experiment (#14862)

Closes https://github.com/coder/coder/issues/14704

---------

Co-authored-by: Kayla Washburn-Love <mckayla@hey.com>

coderd/httpmw/provisionerdaemon.go

@@ -20,10 +20,9 @@ func ProvisionerDaemonAuthenticated(r *http.Request) bool {
 }
 
 type ExtractProvisionerAuthConfig struct {
-	DB              database.Store
-	Optional        bool
-	PSK             string
-	MultiOrgEnabled bool
+	DB       database.Store
+	Optional bool
+	PSK      string
 }
 
 func ExtractProvisionerDaemonAuthenticated(opts ExtractProvisionerAuthConfig) func(next http.Handler) http.Handler {
@@ -39,18 +38,6 @@ func ExtractProvisionerDaemonAuthenticated(opts ExtractProvisionerAuthConfig) fu
 				httpapi.Write(ctx, w, code, response)
 			}
 
-			if !opts.MultiOrgEnabled {
-				if opts.PSK == "" {
-					handleOptional(http.StatusUnauthorized, codersdk.Response{
-						Message: "External provisioner daemons not enabled",
-					})
-					return
-				}
-
-				fallbackToPSK(ctx, opts.PSK, next, w, r, handleOptional)
-				return
-			}
-
 			psk := r.Header.Get(codersdk.ProvisionerDaemonPSK)
 			key := r.Header.Get(codersdk.ProvisionerDaemonKey)
 			if key == "" {