Personal Access Token use with basic auth

Problem Definition

We support PAT since JRASERVER-67869 is resolved. However unlike Bitbucket PAT, Jira PAT cannot be used with Basic Auth (only with Bearer token).
Many plugins (such as Jenkins Jira plugin) do not support Bearer token, but they support basic auth. Therefore it would be helpful to also provide basic auth method with PAT.

Suggested Solution

Provide the ability to basic auth with PAT for Jira Server. Also this would make the PAT usage consistent with Bitbucket's.

Workaround

Continue to use basic auth where this is supported and bearer is not supported.