Selective Debugging: fix bug with SelectedDebugPaths.txt containing u…

…nselected/unfocused targets

Summary:
**Problem**

The `SelectedDebugPaths.txt` contains a list of targets which are not actually focused due to how Swift files are treated. Any targets which include Swift debug info would end up being in `SelectedDebugPaths.txt`, even if not selected/focused.

**Solution**

Ensure that `SelectedDebugPaths.txt` is only computed using the targets which are selected, excluding any targets for debug info purposes.

Reviewed By: chatura-atapattu, manicaesar

Differential Revision: D68146690

fbshipit-source-id: 343adc398bface18b6de91598686e0097dee9702

apple/apple_bundle.bzl

@@ -171,8 +171,8 @@ def _maybe_scrub_binary(ctx, binary_dep: Dependency) -> AppleBundleBinaryOutput:
         dsym_artifact = _get_scrubbed_binary_dsym(ctx, binary, debug_info_tset)
 
         filtered_map = {}
-        for info in filtered_debug_info.infos:
-            filtered_map.setdefault(info.label, []).extend(info.artifacts)
+        for selected_target_info in filtered_debug_info.selected_target_infos:
+            filtered_map.setdefault(selected_target_info.label, []).extend(selected_target_info.artifacts)
 
         debuggable_info = AppleDebuggableInfo(
             dsyms = [dsym_artifact],