Continue test coverage for js-sdk

[AhmedHanafy725]

• Create automation test for all the following modules.
• Some of them has tests already, please check the coverage, and complete it if needed.

  clients

  • [ ] currencylayer (low prio)
  • [ ] explorer
  • [ ] kraken (low prio)
  • [ ] liquid (low prio)
  • [ ] mail (low prio)
  • [ ] s3
  • [ ] stellar (high priority)
  • [ ] syncthing (low prio)
  • [ ] taiga (low prio)
  • [ ] zerotier (later or to be removed)

data

• [ ] countries
• [ ] treemanager (low prio)

sals

• [ ] reservation_chatflow (high priority)
• [ ] zos (high priority)

tools

• [ ] dnstool
• [ ] imagelib
• [ ] poolexecutor
• [ ] tfgateway
• [ ] wireguard

[xmonader]

let's not work on this one as we are doing some changes in the repo structures, most of zos will live in js-grid repo