Create workflow for running tests in packages/render-html

[wjkg]

Copies the testing workflow for css-processor and transient-render-engine and adjusts it for render-html.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.64%. Comparing base (5d91b60) to head (918e095).
⚠️ Report is 3 commits behind head on chore/migrate-render-html-with-history.

Additional details and impacted files

@@                            Coverage Diff                             @@
##           chore/migrate-render-html-with-history      #20      +/-   ##
==========================================================================
- Coverage                                   99.30%   98.64%   -0.66%     
==========================================================================
  Files                                          57      140      +83     
  Lines                                        1153     2074     +921     
  Branches                                      315      633     +318     
==========================================================================
+ Hits                                         1145     2046     +901     
- Misses                                          8       27      +19     
- Partials                                        0        1       +1     

Flag	Coverage Δ
css-processor	100.00% <ø> (ø)
render-html	97.82% <ø> (?)
transient-render-engine	98.95% <ø> (ø)

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