Revert "[clang][ExtractAPI] Add ability to create multiple symbol graphs (llvm#86676)"

This failed the test suite due to missing DiagGroup for a new warning.

This reverts commit b31414b.

Author: daniel-grumberg

clang/include/clang/Basic/DiagnosticDriverKinds.td

@@ -521,12 +521,6 @@ def err_drv_extract_api_wrong_kind : Error<
   "header file '%0' input '%1' does not match the type of prior input "
   "in api extraction; use '-x %2' to override">;
 
-def err_drv_missing_symbol_graph_dir: Error<
-  "Must provide a symbol graph output directory using --symbol-graph-dir=<directory>">;
-
-def err_drv_unexpected_symbol_graph_output : Error<
-  "Unexpected output symbol graph '%1'; please provide --symbol-graph-dir=<directory> instead">;
-
 def warn_slash_u_filename : Warning<"'/U%0' treated as the '/U' option">,
   InGroup<DiagGroup<"slash-u-filename">>;
 def note_use_dashdash : Note<

clang/include/clang/Basic/DiagnosticFrontendKinds.td

@@ -360,6 +360,4 @@ def warn_profile_data_misexpect : Warning<
 def err_extract_api_ignores_file_not_found :
   Error<"file '%0' specified by '--extract-api-ignores=' not found">, DefaultFatal;
 
-def warn_missing_symbol_graph_dir : Warning<"Missing symbol graph output directory, defaulting to working directory">;
-
 }