Enhance Jinja template support to enable workloads to be customized by OpenSearch version

[gkamat]

Is your feature request related to a problem? Please describe

Customizing workloads to behave differently as new OpenSearch features become available is not straightforward. For instance, this test in the big5 workload is unneccesarily complex. Enhancing Jinja template support will simplify this substantially.

Describe the solution you'd like

Update Jinja support to simplify checking the distribution version. Also, auto-setting the distribution version workload parameter may be an option as well.

Describe alternatives you've considered

No response

Additional context

No response