Update log keys to match logstream

[imjasonh]

This updates our log message formats to match the standard format used
in Knative, including by its logstream package.

This should prevent lots of logspam during tests.

Fixes #4777

/kind bug
@vdemeester @afrittoli

cc @dprotaso

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Release Notes

action required
Log lines formatted as JSON have the severity in "severity" (was "level"), timestamp in "timestamp" (was "ts"), and message in "message" (was "msg").

PR friction log:

• check-pr-has-kind-label failed even though the PR content says /kind bug and the label was added by the tekton-robot.
• flaky test retries: 1
• tide — Not mergeable. PR can't be rebased

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[abayer]

/retest

Flaky unit tests have issues at #5152 and #5160.

[abayer]

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[abayer]

Seems fine by me - I forget exactly what the discussions around config/config-logging.yaml we had were, though.

[afrittoli]

Thank you!!

/approve

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[abayer]

/lgtm