Revert HTTP connection adapter with proxy settings
What does this MR do?
This partially reverts !55406 (merged). 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 #216912 (closed)
Edited by Arturo Herrero