Add link permanent link after plumbing setup for beta integration test

[JeromeJu]

Due to the sequence we need for the beta integration test setup:

• First Add prow env for beta integration test #5737 needs to get merged for providing the .env of the beta integration test that prow could point to.
• We need the actual prow setup in plumbing Add beta integration test for V1 release plumbing#1256 then.

However, we need to add a link in #5737 for the update of pull-beta-integration test to be pointed at. Thus this issue is created for a TODO to be followed up once the 2nd PR is merged.

[jerop]

/kind misc

[tekton-robot]

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/lifecycle stale

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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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/lifecycle rotten

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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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