Test collection against Ansible versions 5 and 6 in Jenkins

Desired Outcome

For an Ansible Collection to be certified by RedHat, it needs to be tested against at least two versions of Ansible Core.

Implemented Changes

This PR allows for the tests in the Collection to be configured to run against a particular Ansible major version, and updates the Jenkinsfile to run tests against Ansible 5 and 6, which corresponds to Ansible Core 2.12 and 2.13, respectively.

Connected Issue/Story

CyberArk internal issue link: ONYX-24058

Definition of Done

At least 1 todo must be completed in the sections below for the PR to be merged.

Changelog

[ ] The CHANGELOG has been updated, or
[x] This PR does not include user-facing changes and doesn't require a CHANGELOG update

Test coverage

[ ] This PR includes new unit and integration tests to go with the code changes, or
[x] The changes in this PR do not require tests

Documentation

[ ] Docs (e.g. READMEs) were updated in this PR
[x] A follow-up issue to update official docs has been filed here: [insert issue ID]()
[ ] This PR does not require updating any documentation

Behavior

[ ] This PR changes product behavior and has been reviewed by a PO, or
[ ] These changes are part of a larger initiative that will be reviewed later, or
[x] No behavior was changed with this PR

Security

[ ] Security architect has reviewed the changes in this PR,
[x] These changes are part of a larger initiative with a separate security review, or
[ ] There are no security aspects to these changes

cyberark / ansible-conjur-collection

Test collection against Ansible versions 5 and 6 in Jenkins #170