Enhancement: allow multiple filename attachment exclusion patterns for a mail rule (#5524)

---------

Co-authored-by: shamoon <4887959+shamoon@users.noreply.github.com>

src/paperless_mail/tests/test_mail.py

@@ -592,6 +592,18 @@ class TestMail(
                 exclude_pattern="f1*",
                 expected_matches=["f2.pdf", "f3.pdf", "file.PDf"],
             ),
+            FilterTestCase(
+                "PDF Files without f1 and f2",
+                include_pattern="*.pdf",
+                exclude_pattern="f1*,f2*",
+                expected_matches=["f3.pdf", "file.PDf"],
+            ),
+            FilterTestCase(
+                "PDF Files without f1 and f2 and f3",
+                include_pattern="*.pdf",
+                exclude_pattern="f1*,f2*,f3*",
+                expected_matches=["file.PDf"],
+            ),
             FilterTestCase(
                 "All Files, no PNG",
                 include_pattern="*",