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Issue description

The PipelineRun definition in run.yaml of the exercise uses the obsolete spec.serviceAccountName attribute to select the pipeline service account.

The same applies to grading materials - namely the gradedrun.yaml file.

When trying to define such pipeline run resource, the API server responds with a failure error form one of the mutating webhooks:

Error from server (BadRequest): error when creating "run.yaml": admission webhook "webhook.pipeline.tekton.dev" denied the request: mutation failed: cannot decode incoming new object: json: unknown field "serviceAccountName"

This prevents the exercise from being completed.

The attribute is now called spec.taskRunTemplate.serviceAccountName.