Fix the Retention Policy Agent Name

[khrm]

It should be tekton-results-retention-policy-agent but after kustomize generation, it becomes tekton-results-tekton-results-retention-policy-agent.

Changes

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Release Notes

[khrm]

/assign @enarha @vdemeester

[enarha]

/approve /lgtm

[tekton-robot]

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This pull-request has been approved by: enarha

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[khrm]

/test pull-tekton-results-unit-tests