Fix typos in yield-context-extractor.ts

[camerondubas]

Follow up to #416 fixing some typos. I added a couple of extra tests that actually hit the ElementNode and BlockStatment code paths since there wasn't coverage before.

I'm not super familiar with this stuff, but I think we could simplify ElementNode a bit. Since an HTML element can't be yielded there isn't really a need to compute their modifiers and attributes. This info never gets used. Please correct me if I'm wrong! Happy to open a PR for that as well

[codecov]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (4635e71) 72.84% compared to head (c05e246) 72.84%.
Report is 1 commits behind head on component-context-info-origin.

Additional details and impacted files

@@                      Coverage Diff                       @@
##           component-context-info-origin     #417   +/-   ##
==============================================================
  Coverage                          72.84%   72.84%           
==============================================================
  Files                                 57       57           
  Lines                               4967     4967           
  Branches                             979      979           
==============================================================
  Hits                                3618     3618           
  Misses                              1349     1349           

Files	Coverage Δ
src/utils/yield-context-extractor.ts	56.80% <20.00%> (ø)

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[lifeart]

Hi @camerondubas, thank you for contribution!
Technically, we could yield element, using https://github.com/tildeio/ember-element-helper