Add support for setting the TLS Certificate for CodeConnections Host for GitLab Self Managed VCS

[danishintegra]

Describe the outcome you'd like

We need this module to support configuring the "TLS certificate" for the CodeConnections Host in case of a GitLab Self Managed VCS.

Is your feature request related to a problem you are currently experiencing? If so, please describe.

Currently, we're having to configure the certificate manually, outside terraform state, for our connection.

Additional context

Add any other context or screenshots about the feature request here.