Refactoring: Rename Language to LanguageServerId

This resolves a long-standing naming issue in Serena & SolidLSP.

scripts/demo_find_defining_symbol.py

@@ -12,14 +12,14 @@ from serena.config.serena_config import LanguageBackend, ProjectConfig, Register
 from serena.constants import REPO_ROOT
 from serena.project import Project
 from serena.tools import FindDeclarationTool
-from solidlsp.ls_config import Language
+from solidlsp.ls_config import LanguageServerId
 
 SEPARATOR = "=" * 80
 PYTHON_TEST_REPO = Path(REPO_ROOT) / "test" / "resources" / "repos" / "python" / "test_repo"
 SERVICES_FILE = Path("test_repo") / "services.py"
 
 
-def make_agent(project_root: Path, language: Language, project_name: str) -> SerenaAgent:
+def make_agent(project_root: Path, language: LanguageServerId, project_name: str) -> SerenaAgent:
     """Create an LSP-backed Serena agent for a single explicit project."""
     serena_config = SerenaConfig.from_config_file()
     serena_config.web_dashboard = False
@@ -64,7 +64,7 @@ def find_identifier_occurrence_position(file_path: Path, identifier: str, occurr
 
 
 if __name__ == "__main__":
-    agent = make_agent(PYTHON_TEST_REPO, Language.PYTHON, "demo_python_test_repo")
+    agent = make_agent(PYTHON_TEST_REPO, LanguageServerId.PYTHON, "demo_python_test_repo")
 
     try:
         # letting the language server finish startup