Fixes in various LS and in tests to accommodate diagnostics edge behavior

Also minor fix in go test expectations of symbol name

scripts/demo_run_tools.py

@@ -8,11 +8,12 @@ from pathlib import Path
 from pprint import pprint
 
 from serena.agent import SerenaAgent
-from serena.config.serena_config import SerenaConfig
+from serena.config.serena_config import LanguageBackend, SerenaConfig
 from serena.constants import REPO_ROOT
 from serena.tools import (
     FindFileTool,
     FindReferencingSymbolsTool,
+    GetDiagnosticsForFileTool,
     JetBrainsFindSymbolTool,
     JetBrainsGetSymbolsOverviewTool,
     JetBrainsInlineSymbol,
@@ -24,6 +25,7 @@ from serena.tools import (
 if __name__ == "__main__":
     serena_config = SerenaConfig.from_config_file()
     serena_config.web_dashboard = False
+    serena_config.language_backend = LanguageBackend.LSP
     # project = Path(REPO_ROOT).parent / "serena-jetbrains-plugin-copy"
     project = Path(REPO_ROOT)
     agent = SerenaAgent(project=str(project), serena_config=serena_config)
@@ -40,7 +42,7 @@ if __name__ == "__main__":
     jb_inspections_tool = agent.get_tool(JetBrainsRunInspectionsTool)
 
     result = agent.execute_task(
-        lambda: overview_tool.apply(
+        lambda: diagnostics_in_file_tool.apply(
             # name_path_pattern="SerenaAgent",
             relative_path="test/resources/repos/clojure/test_repo/src/test_app/diagnostics_sample.clj",
             # keep_definition=True,