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/tests/integration/targets/inventory/tasks/main.yml

@@ -8,7 +8,6 @@
   set_fact:
     inv_name1: "AWX-Collection-tests-inventory-inv1-{{ test_id }}"
     inv_name2: "AWX-Collection-tests-inventory-inv2-{{ test_id }}"
-    cred_name1: "AWX-Collection-tests-inventory-cred1-{{ test_id }}"
     group_name1: "AWX-Collection-tests-instance_group-group1-{{ test_id }}"
 
 - block:
@@ -23,21 +22,6 @@
         that:
           - "result is changed"
 
-    - name: Create an Insights Credential
-      credential:
-        name: "{{ cred_name1 }}"
-        organization: Default
-        credential_type: Insights
-        inputs:
-          username: joe
-          password: secret
-        state: present
-      register: result
-
-    - assert:
-        that:
-          - "result is changed"
-
     - name: Create an Inventory
       inventory:
         name: "{{ inv_name1 }}"
@@ -227,10 +211,3 @@
       instance_group:
         name: "{{ group_name1 }}"
         state: absent
-
-    - name: Delete Insights Credential
-      credential:
-        name: "{{ cred_name1 }}"
-        organization: "Default"
-        credential_type: Insights
-        state: absent