Kubeflow 1.4 Release Tracker

[zijianjoy]

Pending:

• Wait for https://github.com/kubeflow/manifests/pull/2033 to be merged.
• Use kubeflow/manifests final 1.4 tag after release.
• Make release candidate and final release for Google Cloud, needs to update tag version in document.

P0:

• [x] https://github.com/kubeflow/pipelines/issues/5680 (2d)
• [x] #302
• [x] #308
• [x] https://github.com/kubeflow/gcp-blueprints/issues/298 (unknown)
• [x] #304
• [x] #310
• [x] #324

P1:

• [x] #306
• [x] #313
• [x] #315
• [x] #317
• [x] #309
• [ ] learn about pod_label

Optional:

• [x] #319
• [ ] #329
• [x] #320

[zijianjoy]

Track remaining items individually.