[feature] Add deletePipelineByName endpoint

[difince]

Feature Area

/area backend

What feature would you like to see?

Add new endpoint - deletePipelineByName

In the case of Pipeline standalone:
/apis/v1beta1/namespaces/-/pipelines/{name}

In the case of full-fledged deployment:
/apis/v1beta1/namespaces/{namespace}/pipelines/{name}

What is the use case or pain point?

Simplify user experience and keep consistent with other tools like Kubernetes, DAGs in Argo, Airflow that use names as a reference instead of UUID
This issue is inspired from ##3360.

Is there a workaround currently?

Yes, use UUIDs instead

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[difince]

/assign @difince difince

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