feat(GODT-2771): gRPC calls for TLS certificates.

internal/certs/cert_store_linux.go

@@ -24,3 +24,7 @@ func installCert([]byte) error {
 func uninstallCert([]byte) error {
 	return nil // Linux doesn't have a root cert store.
 }
+
+func isCertInstalled([]byte) error {
+	return false
+}