What's the problem

Currently pipeline builder in dev console directly queries tekton hub APIs for searching tasks. As upstream community and Red Hat is moving to artifacthub, we need to query artifacthub API for searching tasks.

Acceptance criteria

1. Update the pipeline builder code so that if the API to retrieve tasks is not available, there will be no errors in the UI.
2. Perform a spike to estimate the amount of work it will take to have the pipeline builder use the artifact hub API to retrieve tasks, rather than using the tekton hub API.