sail-operator: remove duplicate unit/integ tests runs

[dgn]

We are now executing unit/integ tests on amd64 using GH Actions to collect coverage information, so we can remove the amd64 executions from prow.

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[istio-testing]

@dgn: Updated the job-config configmap in namespace default at cluster default using the following files:

• key istio-ecosystem.sail-operator.main.gen.yaml using file prow/cluster/jobs/istio-ecosystem/sail-operator/istio-ecosystem.sail-operator.main.gen.yaml

In response to this:

We are now executing unit/integ tests on amd64 using GH Actions to collect coverage information, so we can remove the amd64 executions from prow.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.