tasks require path to inventory yaml

[h0tw1r3]

tasks document the inventory parameter as the "location to inventory file", so make it behave as such.

changes are backwards compatible with puppet_litmus <= 1.3.0

this is the beginning of uncoupling the litmus specific assumptions in the provision module.

[h0tw1r3]

Related to #167

[jordanbreen28]

hey @h0tw1r3 - this is a great change. Could you look to fix the tests and rebase the PR?

[h0tw1r3]

@jordanbreen28 rebased

[jordanbreen28]

@h0tw1r3 thanks! Just noticed after approving we've got an error in ci.. https://github.com/puppetlabs/provision/actions/runs/9853591847

[jordanbreen28]

thanks @h0tw1r3! Amazing