Description of problem:

Pipelines as Code: Pipelinerun cleanup does not work when tweaking "max-keep-runs" annotation between different values.
When tweaking the  "max-keep-runs" annotation between different values, the counter start from "0" instead of the number of runs which were there already.

https://docs.openshift.com/pipelines/1.11/pac/managing-pipeline-runs-pac.html#cleaning-up-pipeline-run-using-pipelines-as-code_managing-pipeline-runs-pac

Prerequisites (if any, like setup, operators/versions):
Steps to Reproduce

1. Create a pipelinerun by setting annotation `pipelinesascode.tekton.dev/max-keep-runs: "3" `  
2. Start 4 pipelineruns after each other. Cleanup works as expected
3. Update the annotation by tweaking `pipelinesascode.tekton.dev/max-keep-runs: "5" `  
4. Start 3 more pipelinerun to see if cleanup works → no cleanup happens
5. Start 6 new pipelineruns to see a new cleanup

Actual results:
Need to start 6 new pipelines to see a cleanup happening. So we are not sure if this is a bug or not but when updating this value the counter start from "0 " instead of the number of runs which were there already.

Expected results:
Need to start only 3 more new pipelineruns to see a new cleanup as the "max-keep-runs" value was tweaked from 3 to 5. Counter should start from "4" as there were already 3 pipelineruns present. 

Reproducibility (Always/Intermittent/Only Once):
Always

Acceptance criteria: 

Definition of Done:

Build Details:
Additional info (Such as Logs, Screenshots, etc):