fix(nextjs-component): don't override _next/image* and _next/static/*…

[dphang]

… origin request lambda with the default lambda

• For _next/static/* and _next/image* cache behaviors, they should not be overridden with default lambda (_next/static/* should have no lambda, and _next/image* should retain the image lambda).
• Also clean up unneeded config in test next-app

[codecov]

Codecov Report

Merging #859 (4d134b0) into master (6adaf00) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #859   +/-   ##
=======================================
  Coverage   80.55%   80.56%           
=======================================
  Files          63       63           
  Lines        2242     2243    +1     
  Branches      505      506    +1     
=======================================
+ Hits         1806     1807    +1     
  Misses        376      376           
  Partials       60       60           

Impacted Files	Coverage Δ
...rless-components/nextjs-component/src/component.ts	91.35% <100.00%> (+0.05%)	⬆️

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