At this point BlueOcean doesn't have native matrix project support. till it doesn't have it, UI should redirect the user to class matrix job page when user clicks on the matrix job.
From the pipeline object (/pipelines/:id API)
- Determine if it's Matrix project type: look for hudson.matrix.MatrixProject capability
- If it's matrix capability then use link's href to redirect the user to the received href pointing to class job. href is going to be path so it should be appended to jenkins base url before redirection
- Open the link in a new window
- Link should be displayed with the "exit to classic" icon