pass full inventory path to task

[h0tw1r3]

• tasks require path to inventory yaml provision#259 blocker

As mentioned in puppetlabs/provision#259, the provision task inventory parameter is documented to be the full path to a bolt inventory file.

This PR moves the spec/fixtures/litmus_inventory.yaml inventory path assumption from the provision module, to here (where it should be).

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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.95%. Comparing base (43df54f) to head (5ab6061).

❗ Current head 5ab6061 differs from pull request most recent head d4739b3. Consider uploading reports for the commit d4739b3 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #552   +/-   ##
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  Coverage   63.95%   63.95%           
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  Files           6        6           
  Lines         763      763           
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  Hits          488      488           
  Misses        275      275           

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