Fix xdist test: enable plugin autoload and match xdist output format

The test_verbose_colored_warnings_xdist test was failing because:
1. pytester subprocess didn't have xdist available (fixed by delenv PYTEST_DISABLE_PLUGIN_AUTOLOAD)
2. xdist output format differs from regular pytest (fixed by matching [gw#] [%] PASSED format)

This matches the pattern used in other xdist tests throughout the test suite.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: treyshaffer

testing/test_terminal.py

@@ -2239,6 +2239,7 @@ def test_verbose_colored_warnings_xdist(
     ) -> None:
         """Test that warning coloring works correctly with pytest-xdist parallel execution."""
         pytest.importorskip("xdist")
+        monkeypatch.delenv("PYTEST_DISABLE_PLUGIN_AUTOLOAD", raising=False)
         monkeypatch.setenv("PY_COLORS", "1")
         pytester.makepyfile(
             test_warning_xdist="""
@@ -2257,12 +2258,18 @@ def test_without_warning():
         )
 
         output = pytester.runpytest("-v", "-n2")
-        output.stdout.re_match_lines(
+        # xdist outputs in random order, and uses format:
+        # [gw#][cyan] [%] [reset][color]STATUS[reset] test_name
+        # Note: \x1b[36m is cyan, which isn't in color_mapping
+        output.stdout.re_match_lines_random(
             color_mapping.format_for_rematch(
                 [
-                    r"test_warning_xdist.py::test_with_warning_1 {yellow}PASSED{reset}",
-                    r"test_warning_xdist.py::test_with_warning_2 {yellow}PASSED{reset}",
-                    r"test_warning_xdist.py::test_without_warning {green}PASSED{reset}",
+                    r"\[gw\d\]\x1b\[36m \[\s*\d+%\] {reset}{yellow}PASSED{reset} "
+                    r"test_warning_xdist.py::test_with_warning_1",
+                    r"\[gw\d\]\x1b\[36m \[\s*\d+%\] {reset}{yellow}PASSED{reset} "
+                    r"test_warning_xdist.py::test_with_warning_2",
+                    r"\[gw\d\]\x1b\[36m \[\s*\d+%\] {reset}{green}PASSED{reset} "
+                    r"test_warning_xdist.py::test_without_warning",
                 ]
             )
         )