fix(e2e): resolve instability issues in end-to-end tests

[l-qing]

Changes

1. Avoid misunderstanding the pod as being ready
   when it is still deleting or in a 0/1 state.

2. Avoid misunderstanding the TektonConfig as being ready
   when it is still in the process of being reconcile.

3. Add the verification of PVC deletion in the undeploy method.
   Avoid the creation of a new hub when the old PVC is still in the
   deleting state, which leads to the failure of starting the new hub.

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Release Notes

NONE

[tekton-robot]

Hi @l-qing. Thanks for your PR.

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[pratap0007]

/ok-to-test

[tekton-robot]

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[jkhelil]

/lgtm