Simplify looking up the RekorAnnotation, add Unit Test for HandleRetry failure

[vaikas]

Simplify looking up the RekorAnnotation, no need for a for loop.

Add a unit test for making sure that if the retry has been exceeded
the TaskRun gets marked as failed.

[tekton-robot]

Hi @vaikas. Thanks for your PR.

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[priyawadhwa]

/ok-to-test

[dlorenc]

/lgtm

[dlorenc]

/approve

[tekton-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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