fix: add an explicit test that q can be non-float (#4667)

* fix: add an explicit test that `q` can be non-`float`

This `suppress(ValueError)` was never tested: https://github.com/litestar-org/litestar/blob/55b69239fda945518f0dc69f7c511efb2d836c7f/litestar/datastructures/headers.py#L403-L404

* Remove a duplicate test case

Author: sobolevn

tests/unit/test_datastructures/test_headers.py

@@ -358,7 +358,6 @@ def test_etag_to_header_weak() -> None:
     (
         ("text/plain", ["text/plain"], "text/plain"),
         ("text/plain", [MediaType.TEXT], MediaType.TEXT),
-        ("text/plain", ["text/plain"], "text/plain"),
         ("text/plain", ["text/html"], None),
         ("text/*", ["text/html"], "text/html"),
         ("*/*", ["text/html"], "text/html"),
@@ -368,6 +367,7 @@ def test_etag_to_header_weak() -> None:
         ("text/plain", ["text/*"], "text/plain"),
         ("text/html", ["*/*"], "text/html"),
         ("text/plain;q=0.8,text/html", ["text/plain", "text/html"], "text/html"),
+        ("text/plain;q=ab,text/html", ["text/plain", "text/html"], "text/plain"),
         ("text/*,text/html", ["text/plain", "text/html"], "text/html"),
     ),
 )