VC 2.0 Add test for VPs with mixed context VCs.

[aljones15]

This adds a test for VPs with VCs that use both the VC 1.0 and 2.0 context.
2.0 VPs should be able to contain mixed version/context VCs.
This PR also improves the language of the test titles including the count in each test title.

An issue with further details is here: #169

[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (update-vc-2.0@9ff44fe). Click here to learn what that means.
The diff coverage is n/a.

Additional details and impacted files

@@               Coverage Diff                @@
##             update-vc-2.0     #171   +/-   ##
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  Coverage                 ?   89.43%           
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  Files                    ?        5           
  Lines                    ?      994           
  Branches                 ?        0           
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  Hits                     ?      889           
  Misses                   ?      105           
  Partials                 ?        0           

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[dlongley]

I didn't look at this line-by-line, but support getting a VP 2.0 test in here that contains VCs with different versions.