Ignore Jira proxy settings columns
What does this MR do?
We no longer need this as we are using the proxy settings via environment variables. https://docs.gitlab.com/omnibus/settings/environment-variables.html#setting-custom-environment-variables.
There is a summary about the reasons to revert this #216912 (comment 532238198).
Related to #325938 (closed)
Edited by Arturo Herrero