Rename Workhorse terminal_specification to channel_specification
What does this MR do?
We're moving conceptually, from the term terminals to channels, in the context of creating WebSocket requests to Workhorse. In this MR we address that replacement.
Related MR https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/9723
Does this MR meet the acceptance criteria?
Conformity
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Code review guidelines -
Merge request performance guidelines -
Style guides -
Separation of EE specific content
Performance and testing
Edited by Francisco Javier López (ex-Gitlab)