Fix exporter panic on whitespace in metric name and add a test case.

[HackToHell]

What this PR does / why we need it

Virtual Machine metrics contain metric names with whitespace in them.,

Which issue this PR fixes

Adds a test case.

Notes

Open to replacing space with a underscore as well.

Checklist

• [ x] DCO signed
• [ x] The PR title has a summary of the changes
• [ x] The PR body has a summary to reflect any significant (and particularly user-facing) changes introduced by this PR

[jkroepke]

Q: where did you find this project?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 36.86%. Comparing base (18a6769) to head (d09d54a).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #12   +/-   ##
=======================================
  Coverage   36.86%   36.86%           
=======================================
  Files           8        8           
  Lines         575      575           
=======================================
  Hits          212      212           
  Misses        325      325           
  Partials       38       38           

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[HackToHell]

Q: where did you find this project?
I was trying to write a version of the exporter with the batch API and was looking in github search and found this.