Provide a way to specify custom SSH config in application settings

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Description

Since custom SSH client configuration using a config file has been deprecated, we should provide a way to specify such configuration in application settings instead. There are some configuration directives (StrictHostKeyChecking, ProxyCommand, etc) that people may want to use.

Proposal

Add a space in the application settings for the instance admin to specify custom SSH client config for git user.

Links / references

• https://gitlab.com/gitlab-org/gitlab-ce/issues/37204
• https://gitlab.zendesk.com/agent/tickets/93336 (internal only)

/cc @nick.thomas