Konflux build pipeline service account migration

[red-hat-konflux-kflux-prd-rh02]

Build pipeline Service Account migration

This PR changes Service Account used by build pipeline from "appstudio-pipeline" to dedicated to the Component Service Account.
Please merge the Service Account update to avoid broken builds when deprected "appstudio-pipeline" Service Account is removed.

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[openshift-ci]

Hi @red-hat-konflux-kflux-prd-rh02[bot]. Thanks for your PR.

I'm waiting for a openshift-knative member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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