Draft: Remove support of old cells config format

Omar Qunsulrequested to merge
513075-remove-support-for-legacy-configuration into master

What does this MR do and why?

The last part of #513075 (moved)

This is a follow up of:

MR acceptance checklist

Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

How to set up and validate locally

  1. Checkout this branch.
  2. (Important) Make sure you are running the latest version of GDK
  3. From Rails console run Settings.cell.topology_service, you should get something in this format
=> #<GitlabSettings::Options:0x000000014c53c828
 @options=
  {"enabled"=>true,
   "address"=>"gdk.test:9095",
   "ca_file"=>"/Users/omar/gdk/gitlab-topology-service/tmp/certs/ca-cert.pem",
   "private_key_file"=>"/Users/omar/gdk/gitlab-topology-service/tmp/certs/client-key.pem",
   "certificate_file"=>"/Users/omar/gdk/gitlab-topology-service/tmp/certs/client-cert.pem"}>

Related to #513075 (moved)

Edited by Omar Qunsul

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