GraphQL - Use enum in cowboy handler configuration and provide test

[Premwoik]

This PR addresses comments from Paweł in the PR about merging HTTP handlers config rework.

#3646 (comment)

#3646 (comment)

[codecov]

Codecov Report

Merging #3648 (301af23) into feature/graphql (bfc1ee0) will decrease coverage by 0.02%.
The diff coverage is 100.00%.

@@                 Coverage Diff                 @@
##           feature/graphql    #3648      +/-   ##
===================================================
- Coverage            81.85%   81.83%   -0.03%     
===================================================
  Files                  480      480              
  Lines                33342    33342              
===================================================
- Hits                 27292    27284       -8     
- Misses                6050     6058       +8     

Impacted Files	Coverage Δ
src/graphql/mongoose_graphql_cowboy_handler.erl	94.18% <100.00%> (+1.16%)	⬆️
src/cassandra/mongoose_cassandra.erl	77.77% <0.00%> (-3.71%)	⬇️
src/pubsub/nodetree_tree.erl	87.87% <0.00%> (-3.04%)	⬇️
src/cassandra/mongoose_cassandra_worker.erl	65.72% <0.00%> (-2.82%)	⬇️
src/pubsub/node_flat.erl	74.21% <0.00%> (-0.40%)	⬇️
src/pubsub/mod_pubsub_db_rdbms.erl	95.34% <0.00%> (-0.26%)	⬇️
src/mod_muc_room.erl	78.53% <0.00%> (-0.17%)	⬇️
src/ejabberd_c2s.erl	88.71% <0.00%> (-0.08%)	⬇️
src/mod_muc_log.erl	63.21% <0.00%> (ø)
src/pubsub/node_pep.erl	79.62% <0.00%> (ø)
... and 5 more

---

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[mongoose-im]

small_tests_24 / small_tests / 301af23
Reports root / small

---

small_tests_23 / small_tests / 301af23
Reports root / small

---

dynamic_domains_pgsql_mnesia_24 / pgsql_mnesia / 301af23
Reports root/ big
OK: 3086 / Failed: 0 / User-skipped: 133 / Auto-skipped: 0

---

dynamic_domains_mysql_redis_24 / mysql_redis / 301af23
Reports root/ big
OK: 3069 / Failed: 0 / User-skipped: 150 / Auto-skipped: 0

---

dynamic_domains_pgsql_mnesia_23 / pgsql_mnesia / 301af23
Reports root/ big
OK: 3086 / Failed: 0 / User-skipped: 133 / Auto-skipped: 0

---

ldap_mnesia_24 / ldap_mnesia / 301af23
Reports root/ big
OK: 1689 / Failed: 0 / User-skipped: 444 / Auto-skipped: 0

---

dynamic_domains_mssql_mnesia_24 / odbc_mssql_mnesia / 301af23
Reports root/ big
OK: 3086 / Failed: 0 / User-skipped: 133 / Auto-skipped: 0

---

ldap_mnesia_23 / ldap_mnesia / 301af23
Reports root/ big
OK: 1689 / Failed: 0 / User-skipped: 444 / Auto-skipped: 0

---

internal_mnesia_24 / internal_mnesia / 301af23
Reports root/ big
OK: 1735 / Failed: 0 / User-skipped: 398 / Auto-skipped: 0

---

elasticsearch_and_cassandra_24 / elasticsearch_and_cassandra_mnesia / 301af23
Reports root/ big
OK: 2049 / Failed: 0 / User-skipped: 399 / Auto-skipped: 0

---

pgsql_mnesia_24 / pgsql_mnesia / 301af23
Reports root/ big
OK: 3460 / Failed: 0 / User-skipped: 142 / Auto-skipped: 0

---

mysql_redis_24 / mysql_redis / 301af23
Reports root/ big
OK: 3455 / Failed: 0 / User-skipped: 147 / Auto-skipped: 0

---

pgsql_mnesia_23 / pgsql_mnesia / 301af23
Reports root/ big
OK: 3460 / Failed: 0 / User-skipped: 142 / Auto-skipped: 0

---

mssql_mnesia_24 / odbc_mssql_mnesia / 301af23
Reports root/ big
OK: 3471 / Failed: 1 / User-skipped: 142 / Auto-skipped: 0

pep_SUITE:pep_tests:unsubscribe_after_presence_unsubscription

{error,
  {{badmatch,
     [{xmlel,<<"message">>,
        [{<<"from">>,
        <<"alice_unsubscribe_after_presence_unsubscription_2092@localhost">>},
         {<<"to">>,
        <<"bob_unsubscribe_after_presence_unsubscription_2092@localhost/res1">>},
         {<<"type">>,<<"headline">>}],
        [{xmlel,<<"event">>,
           [{<<"xmlns">>,
           <<"http://jabber.org/protocol/pubsub#event">>}],
           [{xmlel,<<"items">>,
            [{<<"node">>,<<"lHYoZRr7RV7GMkYiv1yKwQ==">>}],
            [{xmlel,<<"item">>,
               [{<<"id">>,<<"salmon">>}],
               [{xmlel,<<"entry">>,
                  [{<<"xmlns">>,
                  <<"http://www.w3.org/2005/Atom">>}],
                  []}]}]}]},
         {xmlel,<<"headers">>,
           [{<<"xmlns">>,<<"http://jabber.org/protocol/shim">>}],
           []}]}]},
   [{pep_SUITE,'-unsubscribe_after_presence_unsubscription/1-fun-0-',2,
      [{file,"/home/circleci/project/big_tests/tests/pep_SUITE.erl"},
       {line,384}]},
    {escalus_story,story,4,
      [{file,
         "/home/circleci/project/big_tests/_build/default/lib/escalus/src/escalus_story.erl"},
       {line,72}]},
    {test_server,ts_tc,3,[{file,"test_server.erl"},{line,1783}]},
    {test_server,run_test_case_eval1,6,
      [{file,"test_server.erl"},{line,1292}]},
    {test_server,run_test_case_eval,9,
      [{file,"test_server.erl"},{line,1224}]}]}}

Report log

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riak_mnesia_24 / riak_mnesia / 301af23
Reports root/ big
OK: 1896 / Failed: 0 / User-skipped: 394 / Auto-skipped: 0

[JanuszJakubiec]

looks good