[clangd] Disable the NOLINTBBEGIN testcase in clangd.

NOLINTBEGIN is disabled, in 5298333

Author: hokein

clang-tools-extra/clangd/unittests/DiagnosticsTests.cpp

@@ -478,8 +478,9 @@ TEST(DiagnosticTest, ClangTidySuppressionComment) {
       #define BAD2 BAD
       double h = BAD2;  // NOLINT
       // NOLINTBEGIN
-      double x = BAD2;
-      double y = BAD2;
+      // FIXME: re-enable when NOLINTBEGIN suppresss block is enabled in clangd.
+      // double x = BAD2;
+      // double y = BAD2;
       // NOLINTEND
 
       // verify no crashes on unmatched nolints.