Add new credential entry point discovery (#15685)

* - add new entry points
- add logic to check what version of the project is running

* remove former discovery method

* update custom_injectors and remove unused import

* fix how  we load external creds

* remove stale code to match devel

* fix cloudforms test and move credential loading

* add load credentials method to get tests passing

* Conditionalize integration tests if the cred is present

* remove inventory source test

* inventory source is covered in the workflow job template target

awx_collection/test/awx/conftest.py

@@ -18,6 +18,7 @@ import pytest
 from ansible.module_utils.six import raise_from
 
 from ansible_base.rbac.models import RoleDefinition, DABPermission
+from awx.main.tests.conftest import load_all_credentials  # noqa: F401; pylint: disable=unused-import
 from awx.main.tests.functional.conftest import _request
 from awx.main.tests.functional.conftest import credentialtype_scm, credentialtype_ssh  # noqa: F401; pylint: disable=unused-import
 from awx.main.models import (