Update the e2e-mnist example to work with kubeflow 1.3

[Tomcli]

/kind bug

What steps did you take and what happened:
Right now, Katib has a bug that is blocking experiment to run on k8s 1.19. It's fixed in master but probably not for kubeflow 1.3. We may want to remove the Katib section until the bugs are fixed in kubeflow 1.4

Install Kubeflow 1.3 with Tekton.

Move kubeflow/pipelines#5433 into a python file e2e-mnist.py. Then run the below command to compile the KFP into Tekton pipeline

dsl-compile-tekton --py e2e-mnist.py --output e2e-mnist.yaml

Then submit e2e-mnist.yaml to KFP-Tekton and update the necessary input parameters.

What did you expect to happen:
The pipeline should run successfully.

Additional information:
[Miscellaneous information that will assist in solving the issue.]

Environment:

• Python Version (use python --version):
• SDK Version:
• Tekton Version (use tkn version):
• Kubernetes Version (use kubectl version):
• OS (e.g. from /etc/os-release):

[ScrapCodes]

Issue tracking this in upstream repo: kubeflow/pipelines#5306 is still open.

[andreyvelich]

To keep you updated, Katib 0.11 should support K8s 1.19: https://github.com/kubeflow/katib/releases/tag/v0.11.0.
We will include this release in Kubeflow 1.3

At least, I have tested this release in GCP - 1.19.7-gke.1500 version and it's working.
We disabled dynamic Webhook creation, which blocked K8s 1.19 before.