servo: Merge #11429 - Partially enable referrer-policy tests with some modifications (from nox:unlimited-referrer-works); r=jdm

This is a part of @rebstar6's work on #11422, with only her test fixes and the enabling of them, to ease review on the actual implementation.

Source-Repo: https://github.com/servo/servo
Source-Revision: c432e9ac540add7a7224cb20af98519544ae0189

servo/python/tidy/servo_tidy/tidy.py

@@ -54,6 +54,7 @@ ignored_dirs = [
     os.path.join(".", "tests", "wpt", "harness"),
     os.path.join(".", "tests", "wpt", "update"),
     os.path.join(".", "tests", "wpt", "web-platform-tests"),
+    os.path.join(".", "tests", "wpt", "mozilla", "tests", "mozilla", "referrer-policy"),
     os.path.join(".", "tests", "wpt", "sync"),
     os.path.join(".", "tests", "wpt", "sync_css"),
     os.path.join(".", "python", "mach"),