fix: also copy chunks for the revalidate lambda

[kirkness]

Tests may still be flakey for ISR, not sure, however, I noticed they were failing legitimately due to the chunks not being copied into the lambda dir.

[codecov]

Codecov Report

Merging #1099 (d13d382) into master (e703135) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1099      +/-   ##
==========================================
- Coverage   83.58%   83.56%   -0.02%     
==========================================
  Files          89       89              
  Lines        3222     3219       -3     
  Branches      923      919       -4     
==========================================
- Hits         2693     2690       -3     
  Misses        469      469              
  Partials       60       60              

Impacted Files	Coverage Δ
packages/libs/lambda-at-edge/src/build.ts	97.76% <100.00%> (-0.03%)	⬇️

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[dphang]

Thanks! missed that one