rename fn to filter_qc_fail

This name is more intuitive in meaning that the sonde will be filtered
if QC fails. The style is also now consistent with the naming of the function
`filter_no_launch_detect`.

src/halodrops/sonde.py

@@ -299,7 +299,7 @@ def near_surface_coverage(
                 )
             return self
 
-    def qc_filter(self, filter_flags=None):
+    def filter_qc_fail(self, filter_flags=None):
         """
         Filters the sonde based on a list of QC flags. If any of the flags are False, the sonde will be filtered out from creating L2.
         If the sonde passes all the QC checks, the attributes listed in filter_flags will be removed from the sonde object.