Add e2e test for upgrade scenario

[sm43]

Currently we don't have any test for upgrades we only install the a version and check if all components are ready. we need to add test for upgrade.

[sm43]

probable solution as discussed in WG

Install the latest release operator version, 
Let it bring up all components
Then uninstall previous operator releases without deletion what operator installed
Then install current build
Wait for it to become successful and alive

[savitaashture]

WG discussion point

1. Install latest release version
2. Upgarde to PR commit
3. Run e2e to verify successful upgradation

[nikhil-thomas]

wg discussion: how do we run it. use plumbing prow job which creates a kind cluster. then run the the upgrade test on it.

[vdemeester]

We should probably try to use kind for this https://github.com/tektoncd/plumbing/blob/d765a5cba75fe5c3d4b67b8651caf72e704a22dc/tekton/images/kind-e2e/setup-kind.sh

[tekton-robot]

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[tekton-robot]

@tekton-robot: Closing this issue.

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