fix: Download JS SDKs at once in a single session

[BYK]

Since we download JS SDKs in a for loop which invokes a separate docker container for each curl run, we seem to be triggering some sort of a DoS protection. And rightfully so as the old method causes TCP and TLS churn although we advertise we support HTTP/1.1 and HTTP/2.

This patch does a few things:

1. Uses curls globbing support to download all files in one go, maxing TCP and TLS reuse. This should fix the DoS protection
2. Uses curl's --compress option to make things even more efficient
3. Uses curl's --create-dirs to save 1 docker container run per version for creating the directory
4. Removes the -I HEAD checks in favor of a -f fail option combined with || true which makes curl fail and not write the output on a non-200 response while still allowing the script to succeed
5. To make sure the above approach works, it adds a file size test, requiring all downloaded files to be larger than 1kB

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.01%. Comparing base (2a7abf2) to head (acb9091).
Report is 1 commits behind head on master.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3417   +/-   ##
=======================================
  Coverage   99.01%   99.01%           
=======================================
  Files           3        3           
  Lines         203      203           
=======================================
  Hits          201      201           
  Misses          2        2           

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[aldy505]

Lets just do this for now.