ROX-33567: Use vpc_inventory to retrieve IBM VMs

[ovalenti]

Description

The IBM cloudcollection provides an inventory plugin. We used to create an inventory yaml file for the VMs we create in the IBM cloud, and this seems to have led to VM leaks. By using the inventory, we hope to address those leak issues (and also to simplify housekeeping).

Checklist

• Investigated and inspected CI test results
• Updated documentation accordingly

Automated testing

• Added unit tests
• Added integration tests
• Added regression tests

If any of these don't apply, please comment below.

Testing Performed

TODO(replace-me)
Use this space to explain how you tested your PR, or, if you didn't test it, why you did not do so. (Valid reasons include "CI is sufficient" or "No testable changes")
In addition to reviewing your code, reviewers must also review your testing instructions, and make sure they are sufficient.

For more details, ref the Confluence page about this section.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 27.38%. Comparing base (d849979) to head (20942f0).
⚠️ Report is 4 commits behind head on master.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3129   +/-   ##
=======================================
  Coverage   27.38%   27.38%           
=======================================
  Files          95       95           
  Lines        5427     5427           
  Branches     2548     2548           
=======================================
  Hits         1486     1486           
  Misses       3214     3214           
  Partials      727      727           

Flag	Coverage Δ
collector-unit-tests	27.38% <ø> (ø)

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