fix(lambda-at-edge): for serverless-trace, don't copy when source and…

[dphang]

… destination are the same.

Should fix: #461

Not sure why but somehow nodeFileTrace may be resolving the wrong files for certain project structure, so when copying if destination and source are the same, the fse.copy promise will fail and hence fail the build. Though still not completely unsure why, this at least avoids the error and allows the build to continue, which is a better developer experience.

[codecov]

Codecov Report

Merging #760 into master will decrease coverage by 0.03%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master     #760      +/-   ##
==========================================
- Coverage   79.70%   79.66%   -0.04%     
==========================================
  Files          55       55              
  Lines        1808     1810       +2     
  Branches      394      395       +1     
==========================================
+ Hits         1441     1442       +1     
- Misses        309      310       +1     
  Partials       58       58              

Impacted Files	Coverage Δ
packages/libs/lambda-at-edge/src/build.ts	93.33% <66.66%> (-0.39%)	⬇️

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