[6.15.z] Move ansible API tests to Ansible-Cfgmgmt and REX classes

[Satellite-QE]

Cherrypick of PR: #14626

Problem Statement

Ansible tests are mixed in API ansible module, which need to be consistent as CLI/UI module

Solution

Move Ansible API tests to Ansible-ConfigurationManagement and Ansible-RemoteExecution classes, And few other minor fixes.

[Satellite-QE]

trigger: test-robottelo
pytest: tests/foreman/api/test_ansible.py

[Satellite-QE]

PRT Result

Build Number: 6321
Build Status: UNSTABLE
PRT Comment: pytest tests/foreman/api/test_ansible.py --external-logging
Test Result : =========== 12 passed, 1330 warnings, 1 error in 5883.20s (1:38:03) ============

[Satellite-QE]

PRT Result

Build Number: 6325
Build Status: UNSTABLE
PRT Comment: pytest tests/foreman/api/test_ansible.py --external-logging
Test Result : =========== 12 passed, 1228 warnings, 1 error in 5335.51s (1:28:55) ============

[Gauravtalreja1]

PRT looks due to an intermittent issue, so I think this PR is ready for review/merge

[omkarkhatavkar]

both the time the single test tests.foreman.api.test_ansible.TestAnsibleCfgMgmt.test_positive_read_facts_with_filter[rhel8] is getting failed same reason as 500 error

  "error": {"message":"PG::ForeignKeyViolation: ERROR:  update or delete on table \"hosts\" violates foreign key constraint \"fact_values_host_id_fk\" on table \"fact_values\"\nDETAIL:  Key (id)=(6) is still referenced from table \"fact_values\".\n"}
}

[Gauravtalreja1]

trigger: test-robottelo
pytest: tests/foreman/api/test_ansible.py::TestAnsibleCfgMgmt

[Satellite-QE]

PRT Result

Build Number: 6444
Build Status: SUCCESS
PRT Comment: pytest tests/foreman/api/test_ansible.py::TestAnsibleCfgMgmt --external-logging
Test Result : ================= 5 passed, 301 warnings in 1508.93s (0:25:08) =================