Description of problem:
If an Ansible collection is installed on Satellite to /etc/ansible/collections, the roles from the collection are imported to Satellite, and roles from that collection are then assigned to a host, Satellite is unable to find those roles when Ansible roles are run on the host. 

Version-Release number of selected component (if applicable):
Satellite 6.10, snap 9
tfm-rubygem-foreman_ansible-6.3.1-1.el7sat.noarch
tfm-rubygem-smart_proxy_ansible-3.1.0-1.el7sat.noarch

How reproducible:
100%

Steps to Reproduce:
1. Install an Ansible Collection to /etc/ansible/collections:

  # ansible-galaxy collection install ericsysmin.system -p /etc/ansible/collections/

2. Import the roles from the collection on the Configure > Roles page of the Satellite webUI.
3. Register a host to Satellite and configure it for remote execution.
4. Assign one or more roles from the collection to the host.
5. Select the "Run Ansible roles" option from the Hosts > All Hosts > [hostname] page of the Satellite webUI.

Actual results:
The task appears to complete successfully, but the roles from the collection are not actually run. The following error appears in the Dynflow console entry for the task:

~~~
  - output_type: stdout
    output: "\r\nTASK [Apply roles] *************************************************************\n"
    timestamp: 1626461088.7711945
  - output_type: stdout
    output: "\n"
    timestamp: 1626461088.7712917
  - output_type: stdout
    output: "\n"
    timestamp: 1626461088.771384
  - output_type: stdout
    output: "\n"
    timestamp: 1626461088.7714665
  - output_type: stdout
    output: "\n"
    timestamp: 1626461088.7716033
  - output_type: stdout
    output: 'ERROR! the role ''ericsysmin.system.chrony'' was not found in /tmp/d20210716-9401-1q84fq9/project/roles:/etc/ansible/roles:/usr/share/ansible/roles:/tmp/d20210716-9401-1q84fq9/project
~~~

Expected results:
Roles in an Ansible Collection installed to /etc/ansible/collections run successfully on hosts.

Additional info:
If the same collection is installed to /usr/share/ansible/collections and the roles from the collection are imported to Satellite, those roles run successfully after being assigned to a host.