Fixed the Applitools Plugin for newer versions of Jenkins

[itaibh]

Fixed the Applitools Plugin for newer versions of Jenkins, by using other method for REST communication.

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• Ensure that the pull request title represents the desired changelog entry
• Please describe what you did
• Link to relevant issues in GitHub or Jira
• Link to relevant pull requests, esp. upstream and downstream changes
• Ensure you have provided tests - that demonstrates feature works or fixes the issue

[sghill]

Any reason to not use the apache-httpcomponents-client-4-api plugin here instead?

[sghill]

Thanks for making this change @itaibh! I don't see a newer version published to the Jenkins repository, is that on the way?

[itaibh]

Sure, once we remember how to and find the time for that.

[sghill]

Cool, let me know if I can help.

Happy to resolve the conflicts in #9, and I've set up a plugin on the new GHActions-based Jenkins CD workflow before.