Merge pull request swiftlang#84133 from a7medev/test/add-missing-signaturehelp-in-sourcekitd-test

[Test] Add signaturehelp to supported requests list in sourcekitd-test

Author: hamishknight

tools/SourceKit/tools/sourcekitd-test/TestOptions.cpp

@@ -174,6 +174,7 @@ bool TestOptions::parseArgs(llvm::ArrayRef<const char *> Args) {
                      << "- complete.setpopularapi\n"
                      << "- typecontextinfo\n"
                      << "- conformingmethods\n"
+                     << "- signaturehelp\n"
                      << "- cursor\n"
                      << "- related-idents\n"
                      << "- syntax-map\n"