Support dsym_folder output group in tests (#1703)

Unclear why #1072 explicitly didn't allow tests to generate dsym files via the `dsym_folder` output group.

This change allows them to do so and make debugging easier on macos.
 
Manual verification on macos:

```
bazel build -c dbg //test/unit/debug_info:myrusttest
rust-lldb bazel-bin/test/unit/debug_info/test-2282882243/myrusttest \
    --one-line "image list" \
    --one-line "exit" | \
    grep DWARF &>/dev/null && echo "dSYM module loaded"
```

should print `dSYM module loaded`

rust/private/rustc.bzl

@@ -1172,7 +1172,7 @@ def rustc_compile_action(
     # types that benefit from having debug information in a separate file.
     pdb_file = None
     dsym_folder = None
-    if crate_info.type in ("cdylib", "bin") and not crate_info.is_test:
+    if crate_info.type in ("cdylib", "bin"):
         if toolchain.os == "windows":
             pdb_file = ctx.actions.declare_file(crate_info.output.basename[:-len(crate_info.output.extension)] + "pdb", sibling = crate_info.output)
             action_outputs.append(pdb_file)

test/unit/debug_info/debug_info_analysis_test.bzl

@@ -1,7 +1,7 @@
 """Analysis tests for debug info in cdylib and bin targets."""
 
 load("@bazel_skylib//lib:unittest.bzl", "analysistest", "asserts")
-load("//rust:defs.bzl", "rust_binary", "rust_shared_library")
+load("//rust:defs.bzl", "rust_binary", "rust_shared_library", "rust_test")
 
 def _pdb_file_test_impl(ctx):
     env = analysistest.begin(ctx)
@@ -95,12 +95,46 @@ def debug_info_analysis_test_suite(name):
         target_compatible_with = ["@platforms//os:macos"],
     )
 
+    rust_test(
+        name = "myrusttest",
+        srcs = ["test.rs"],
+        edition = "2018",
+    )
+
+    native.filegroup(
+        name = "mytest.pdb",
+        srcs = [":myrusttest"],
+        output_group = "pdb_file",
+        testonly = True,
+    )
+
+    pdb_file_test(
+        name = "test_pdb_test",
+        target_under_test = ":mytest.pdb",
+        target_compatible_with = ["@platforms//os:windows"],
+    )
+
+    native.filegroup(
+        name = "mytest.dSYM",
+        srcs = [":myrusttest"],
+        output_group = "dsym_folder",
+        testonly = True,
+    )
+
+    dsym_folder_test(
+        name = "test_dsym_test",
+        target_under_test = ":mytest.dSYM",
+        target_compatible_with = ["@platforms//os:macos"],
+    )
+
     native.test_suite(
         name = name,
         tests = [
             ":lib_pdb_test",
             ":lib_dsym_test",
             ":bin_pdb_test",
             ":bin_dsym_test",
+            ":test_pdb_test",
+            ":test_dsym_test",
         ],
     )

test/unit/debug_info/test.rs

@@ -0,0 +1,4 @@
+#[test]
+fn test() {
+    eprintln!("test");
+}