[clang-doc] Disable flaky test basic-project.test

Author: Endilll

clang-tools-extra/test/clang-doc/basic-project.test

@@ -1,3 +1,6 @@
+// See https://github.com/llvm/llvm-project/issues/97507.
+// UNSUPPORTED: target={{.*}}
+
 // RUN: rm -rf %t && mkdir -p %t/docs %t/build
 // RUN: sed 's|$test_dir|%/S|g' %S/Inputs/basic-project/database_template.json > %t/build/compile_commands.json
 // RUN: clang-doc --format=html --output=%t/docs --executor=all-TUs %t/build/compile_commands.json