Support project redirection when moving component projects

Problem

With component projects from gitlab.com/gitlab-components being shown in the catalog and the plan to migrate them to gitlab.com/components we could have users that are using the existing path. Moving projects could be a breaking change because the include syntax does not support route redirection.

Proposal

• Leverage route redirection when finding component projects.
• Document that include:component supports redirection, as opposed to other include types.