Add Logs In http_utils.js

[shirady]

Explain the changes

1. Add logs in levels 2 and 3 to help support and developers understand the parameters that we have in the functions _get_http_agent and should_proxy. It was not set in debug level 0 or 1 because every creation of S3 Client with an agent would call those functions.

Issues: Fixed #xxx / Gap #xxx

1. none, I had a BZ 2238334 where I had to assume the values and do a dry-run to understand what happens. It could be easier for support and developers to find those values in the logs in such cases.

Testing Instructions:

1. Deploy noobaa on MInikube or Rancher Desktop (see guide).
   Note: nb is an alias that runs the local operator from build/_output/bin (alias created by devenv).
2. Set debug level of 3 by running: nb system set-debug-level 3
3. Create a new backingstore: nb backingstore create aws-s3 <backing-store-name> (optional: add the --region flag).
4. Check the logs of noobaa-core: k logs noobaa-core-0 -f look for should_proxy: and _get_http_agent: printings.

• Doc added/updated
• Tests added