Remove dry_run and overloads from remaining editing methods

Add corresponding test classes and test cases (not yet working)

scripts/demo_run_tools.py

@@ -24,20 +24,8 @@ class InMemorySerenaConfig(SerenaConfigBase):
 if __name__ == "__main__":
     project_path = str(Path("test") / "resources" / "repos" / "python" / "test_repo")
     agent = SerenaAgent(project=project_path, serena_config=InMemorySerenaConfig())
-    find_symbol_tool = agent.get_tool(FindSymbolTool)
 
+    # apply a tool
+    find_symbol_tool = agent.get_tool(FindSymbolTool)
     print("Finding the symbol 'VariableContainer'\n")
     pprint(json.loads(find_symbol_tool.apply("VariableContainer", within_relative_path=str(Path("test_repo") / "variables.py"))))
-
-    # modifying with dry-run
-    symbol_manager = agent.symbol_manager
-
-    code_diff = symbol_manager.insert_after_symbol(
-        "VariableContainer/modify_instance_var",
-        relative_file_path=str(Path("test_repo") / "variables.py"),
-        body="test test\nsecond line",
-        dry_run=True,
-    )
-    print(f"Deleted lines: {code_diff.deleted_lines}")
-    print(f"Added lines: {code_diff.added_lines}")
-    print(f"Edited module: {code_diff.modified_content}")