Add member filter for user type

What does this MR do and why?

Describe in detail what your merge request does and why.

Adds ability to filter group members by user type.

Related to #338354 (closed)

The groups controller now accepts a user_type param, such as https://gitlab.example.com/groups/flightjs/-/group_members?user_type=service_account. This query would allow a group owner to filter by the specified user type. Similarly, this then adds the filtering ability to the group member finder.

This is the backend component to the frontend which is handled as part of !113884 (merged)

Database

Formatted query with user_type filter

SELECT
    members.*
FROM
    (
        SELECT
            DISTINCT ON ( user_id, invite_email )
            *
        FROM
            members
        WHERE
            members.type = 'GroupMember' AND
            members.source_type = 'Namespace' AND
            members.requested_at IS NULL AND
            members.source_id IN (
                SELECT
                    namespaces.id
                FROM
                    (
                        SELECT
                            namespaces.*
                        FROM
                            namespaces
                        WHERE
                            namespaces.type = 'Group' AND
                            namespaces.id = 634
                    ) AS namespaces
                WHERE
                    namespaces.type = 'Group'
            ) AND
            members.access_level > 5
        ORDER BY
            user_id,
            invite_email,
            access_level DESC,
            expires_at DESC,
            created_at ASC
    ) AS members
    LEFT JOIN users ON users.id = members.user_id
WHERE
    members.type = 'GroupMember' AND
    users.user_type = 13;

Execution plan

 Nested Loop  (cost=9.00..12.05 rows=1 width=188) (actual time=3.879..3.881 rows=0 loops=1)
   Buffers: shared hit=12 read=4
   I/O Timings: read=3.794 write=0.000
   ->  Subquery Scan on members  (cost=8.44..8.46 rows=1 width=188) (actual time=3.878..3.880 rows=0 loops=1)
         Filter: ((members.type)::text = 'GroupMember'::text)
         Rows Removed by Filter: 0
         Buffers: shared hit=12 read=4
         I/O Timings: read=3.794 write=0.000
         ->  Unique  (cost=8.44..8.45 rows=1 width=188) (actual time=3.878..3.879 rows=0 loops=1)
               Buffers: shared hit=12 read=4
               I/O Timings: read=3.794 write=0.000
               ->  Sort  (cost=8.44..8.44 rows=1 width=188) (actual time=3.877..3.878 rows=0 loops=1)
                     Sort Key: members_1.user_id, members_1.invite_email, members_1.access_level DESC, members_1.expires_at DESC, members_1.created_at
                     Sort Method: quicksort  Memory: 25kB
                     Buffers: shared hit=12 read=4
                     I/O Timings: read=3.794 write=0.000
                     ->  Nested Loop Semi Join  (cost=1.13..8.43 rows=1 width=188) (actual time=3.826..3.826 rows=0 loops=1)
                           Buffers: shared read=4
                           I/O Timings: read=3.794 write=0.000
                           ->  Index Scan using index_members_on_source_id_and_source_type on public.members members_1  (cost=0.56..4.83 rows=1 width=188) (actual time=3.825..3.825 rows=0 loops=1)
                                 Index Cond: ((members_1.source_id = 634) AND ((members_1.source_type)::text = 'Namespace'::text))
                                 Filter: ((members_1.requested_at IS NULL) AND (members_1.access_level > 5) AND ((members_1.type)::text = 'GroupMember'::text))
                                 Rows Removed by Filter: 0
                                 Buffers: shared read=4
                                 I/O Timings: read=3.794 write=0.000
                           ->  Index Scan using namespaces_pkey on public.namespaces  (cost=0.56..3.58 rows=1 width=4) (actual time=0.000..0.000 rows=0 loops=0)
                                 Index Cond: (namespaces.id = 634)
                                 Filter: ((namespaces.type)::text = 'Group'::text)
                                 Rows Removed by Filter: 0
                                 I/O Timings: read=0.000 write=0.000
   ->  Index Only Scan using index_users_on_user_type_and_id on public.users  (cost=0.56..3.58 rows=1 width=4) (actual time=0.000..0.000 rows=0 loops=0)
         Index Cond: (users.user_type = 13)
         Heap Fetches: 0
         I/O Timings: read=0.000 write=0.000

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