Investigate duplicate events and how we test them

[afrittoli]

Feature request

In #3375, we patched the cancel test as it was getting a duplicate event.
This was only reproducible - in my knowledge - with the cancel test, and only the beta1 version of it.
We should understand why the failure only happened there, and if in general we shall expect events might be delivered more than once; and if so we should adapt tests to allow for it.

[tekton-robot]

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[tekton-robot]

Stale issues rot after 30d of inactivity.
Mark the issue as fresh with /remove-lifecycle rotten with a justification.
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If this issue is safe to close now please do so with /close with a justification.
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[tekton-robot]

Rotten issues close after 30d of inactivity.
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/close

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[tekton-robot]

@tekton-robot: Closing this issue.

In response to this:

Rotten issues close after 30d of inactivity.
Reopen the issue with /reopen with a justification.
Mark the issue as fresh with /remove-lifecycle rotten with a justification.
If this issue should be exempted, mark the issue as frozen with /lifecycle frozen with a justification.

/close

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