improve instructions for automated conformance runs

[BenTheElder]

The upstream CNCF conformance guide has some instructions for running with their sonobuoy config, which the testgrid uploader supports, but the instructions are semi-manual.

We should include detailed instructions for using this in provider automation (jenkins etc.) in the testgrid displaying conformance results guide as well as possibly SIG Cloud Provider KEP: Reporting Conformance Test Results to Testgrid.

/cc @andrewsykim @timothysc

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