Fix generation of custom resource lambda zip

[medikoo]

In case of custom resource lambda packaging process being stopped in a middle, we were left with broken zip that was accepted for further deployment.

Fix is to generate zip to temporary directory and move it once generation of archive is finalized

Closes: #7242

[codecov-io]

Codecov Report

Merging #7684 into master will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #7684      +/-   ##
==========================================
- Coverage   88.01%   88.01%   -0.01%     
==========================================
  Files         245      245              
  Lines        9213     9225      +12     
==========================================
+ Hits         8109     8119      +10     
- Misses       1104     1106       +2     

Impacted Files	Coverage Δ
lib/plugins/aws/customResources/generateZip.js	90.00% <100.00%> (+1.11%)	⬆️
.../compile/events/apiGateway/lib/hack/updateStage.js	95.54% <0.00%> (-1.09%)	⬇️
...plugins/aws/package/compile/events/stream/index.js	98.65% <0.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 2ad7bd3...3649bd2. Read the comment docs.