Remove usage of environment.sh

This is no longer sourced in the launch scripts.

roles/installer/templates/environment.sh.j2

@@ -1,5 +0,0 @@
-DATABASE_USER={{ awx_postgres_user }}
-DATABASE_NAME={{ awx_postgres_database }}
-DATABASE_HOST={{ awx_postgres_host }}
-DATABASE_PORT={{ awx_postgres_port }}
-DATABASE_PASSWORD={{ awx_postgres_pass | quote }}

roles/installer/templates/tower_app_credentials.yaml.j2

@@ -7,5 +7,4 @@ metadata:
   namespace: '{{ meta.namespace }}'
 data:
   credentials_py: "{{ lookup('template', 'credentials.py.j2') | b64encode }}"
-  environment_sh: "{{ lookup('template', 'environment.sh.j2') | b64encode }}"
   ldap_py: "{{ lookup('template', 'ldap.py.j2') | b64encode }}"

roles/installer/templates/tower_deployment.yaml.j2

@@ -218,8 +218,6 @@ spec:
             items:
               - key: credentials_py
                 path: 'credentials.py'
-              - key: environment_sh
-                path: 'environment.sh'
               - key: ldap_py
                 path: 'ldap.py'
         - name: "{{ secret_key_secret_name }}"