Swap TF with Training Operator

[andreyvelich]

Recently we renamed tf-operator to training-operator: kubeflow/training-operator#1348.
We should make the appropriate changes in the prow settings.

/assign @kubeflow/wg-training-leads

@PatrickXYS Do you know, does prow cluster automatically carry the new changes ?

Checklist:

If PR related to Optional-Test-Infra,

• Changes need to be generated to aws/GitOps folder:
  1. cd aws
  2. make optional-generate
  3. make optional-test

[terrytangyuan]

Hold until we are clear on how the change is going to take effect

/lgtm
/hold

[gaocegege]

lgtm

[andreyvelich]

/hold cancel
Let's try to merge it and see if prow will use the new repo.

[Jeffwan]

Let me reach out to @PatrickXYS to leave a comment

[Jeffwan]

The cluster does automatically pick up latest changes.

[andreyvelich]

It's great news @Jeffwan!
@PatrickXYS @theofpa @Bobgy @capri-xiyue @zijianjoy Please help with approval this PR.

[theofpa]

/lgtm
/approve

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