remove loader_attic tests from test_store

remove loader_attic tests from test_store

With the removal of engines we need to handle the loader_attic test that
will fail with said removal

based on the advice of @levitte, given that we have a file: loader in
the default provider already, theres no need to test an engine thats
going away, so just remove it.

Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Shane Lontis <shane.lontis@oracle.com>
Reviewed-by: Paul Dale <ppzgs1@gmail.com>
(Merged from https://github.com/openssl/openssl/pull/28461)