fix: split discovery and instrumentation log messages for E2E harnesses

Log "Discovered N existing unit test files" after counting tests, and
"Instrumented N existing unit test files" after injecting profiling.
Python E2E harness matches "Discovered", JS harness matches "Instrumented".

Author: KRRT7

codeflash/optimization/function_optimizer.py

@@ -1625,6 +1625,18 @@ def instrument_existing_tests(self, function_to_all_tests: dict[str, set[Functio
                 msg = f"Unexpected test type: {test_type}"
                 raise ValueError(msg)
 
+        if existing_test_files_count > 0 or replay_test_files_count > 0 or concolic_coverage_test_files_count > 0:
+            logger.info(
+                f"Discovered {existing_test_files_count} existing unit test file"
+                f"{'s' if existing_test_files_count != 1 else ''}, {replay_test_files_count} replay test file"
+                f"{'s' if replay_test_files_count != 1 else ''}, and "
+                f"{concolic_coverage_test_files_count} concolic coverage test file"
+                f"{'s' if concolic_coverage_test_files_count != 1 else ''} for {func_qualname}"
+            )
+            console.rule()
+
+        for (test_file, test_type), tests_in_file_list in test_file_invocation_positions.items():
+            path_obj_test_file = Path(test_file)
             # Use language-specific instrumentation
             success, injected_behavior_test = self.language_support.instrument_existing_test(
                 test_path=path_obj_test_file,
@@ -1696,13 +1708,11 @@ def get_instrumented_path(original_path: str, suffix: str) -> Path:
                     )
                 )
 
-        if existing_test_files_count > 0 or replay_test_files_count > 0 or concolic_coverage_test_files_count > 0:
+        instrumented_count = len(unique_instrumented_test_files) // 2  # each test produces behavior + perf files
+        if instrumented_count > 0:
             logger.info(
-                f"Discovered {existing_test_files_count} existing unit test file"
-                f"{'s' if existing_test_files_count != 1 else ''}, {replay_test_files_count} replay test file"
-                f"{'s' if replay_test_files_count != 1 else ''}, and "
-                f"{concolic_coverage_test_files_count} concolic coverage test file"
-                f"{'s' if concolic_coverage_test_files_count != 1 else ''} for {func_qualname}"
+                f"Instrumented {instrumented_count} existing unit test file"
+                f"{'s' if instrumented_count != 1 else ''} for {func_qualname}"
             )
             console.rule()
         return unique_instrumented_test_files

tests/scripts/end_to_end_test_utilities.py

@@ -220,7 +220,7 @@ def validate_output(stdout: str, return_code: int, expected_improvement_pct: int
             return False
 
     if config.expected_unit_test_files is not None:
-        # Match the per-function test discovery message from function_optimizer.py
+        # Match the per-function discovery message from function_optimizer.py
         # Format: "Discovered X existing unit test files, Y replay test files, and Z concolic..."
         unit_test_files_match = re.search(r"Discovered (\d+) existing unit test files?", stdout)
         if not unit_test_files_match: