Update httparty to gitlab http

What does this MR do and why?

In Vertex client we used Httparty directly, which is not encouraged. This MR is changing this to the prefered way using Gitlab::HTTP

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Before	After

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

resolves https://gitlab.com/gitlab-org/gitlab/-/issues/410272