Remove Gitlab::Integrations::StiType (custom attribute class for adapting an integration's type value)
After #333508 (closed) we can remove the Gitlab::Integrations::StiType
custom attribute class as it will no longer be needed.
Availability & Testing
Thoughts: removing StiType
after the type migration should be covered by existing feature/e2e specs.
Some specs may need to be removed/updated.
Edited by Sean Gregory