Description of problem:

When deploying Pipelineruns and Taskruns using Helm Templates, Pipelines controller is failing to add the required label `managed-by: tekton-pipelines` causing failure in updating the required env variables such as `SSL_CERT_DIR`.

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

Steps to Reproduce

1. Deploy the Pipelineruns using Helm Teamplates.
2. Verify the label on Pipelinrun

Actual results:{}

The label `managed-by: Helm` is applied to Pipelineruns 

Expected results:

The label `managed-by: tekton-pipelines` should be applied to Pipelineruns 

Reproducibility (Always/Intermittent/Only Once):

Always

Acceptance criteria: 

Definition of Done:

Build Details:

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

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