OCM-7253 | feat: Refactor describe machine pool cmd to use new default runner

[hunterkepley]

OCM-7253

Pt 2 to the RCI Milestone 2 for describe machine-pool

Refactors the command to use new default runner, and refactors tests

DoD:

Command uses new default runner
Command has at least 70% unit test coverage

[codecov]

Codecov Report

Attention: Patch coverage is 88.33333% with 7 lines in your changes are missing coverage. Please review.

Project coverage is 22.57%. Comparing base (2eaeea7) to head (e86d5a7).
Report is 38 commits behind head on master.

Files	Patch %	Lines
cmd/describe/machinepool/cmd.go	79.41%	3 Missing and 4 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1938      +/-   ##
==========================================
+ Coverage   21.69%   22.57%   +0.88%     
==========================================
  Files         118      131      +13     
  Lines       19797    20861    +1064     
==========================================
+ Hits         4294     4710     +416     
- Misses      15181    15799     +618     
- Partials      322      352      +30     

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[hunterkepley]

DoD met

[hunterkepley]

/retest

[robpblake]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hunterkepley, robpblake

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[openshift-ci]

@hunterkepley: all tests passed!

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