add NCEI downstream plugin test

[ocefpaf]

We thought that ioos/cc-plugin-ncei#52 would break this test here but it turns out we are not testing this plugin. Maybe we don't need it anymore? Do you know why we don't have it here @benjwadams?

Anyway, the NCEI plugin has an upstream test and should pass here as well. Let's try...

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.91%. Comparing base (ed9f59b) to head (21364f9).
Report is 7 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1072      +/-   ##
===========================================
- Coverage    82.03%   81.91%   -0.13%     
===========================================
  Files           24       24              
  Lines         5178     5171       -7     
  Branches      1247     1237      -10     
===========================================
- Hits          4248     4236      -12     
- Misses         631      634       +3     
- Partials       299      301       +2     

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[ocefpaf]

Self-merging this one b/c it only adds a new plugin test.