Currently, when a user has permissions on a function/all functions in
keyspace, and the function/keyspace is dropped, the user keeps the
permissions. As a result, when a new function/keyspace is created
with the same name (and signature), they will be able to use it even
if no permissions on it are granted to them.
Simliarly to regular UDFs, the same applies to UDAs.
After this patch, the corresponding permissions on functions are dropped
when a function/keyspace is dropped.
Fixes#13820Closes#13823
9ae1b02144