Use alternate internal comments/vars from whitelist/blacklist

[chases2]

xref #19264

I tried to be context-sensitive in choosing new names, trying to best reflect the idea the comment/variable is trying to convey.

This PR doesn't cover files that change Prow Config options; those changes will require deprecations.

[chases2]

Running bazel test in verify-owners fails flagrantly when I try to run it locally, but the same failures don't show up when Prow runs the tests (even without my changes).

Is the git stub being used in them not working locally? Or do I have some build artifact out of place?
verify-owners_test.go:1242: Switching to master branch: /usr/bin/git [checkout master]: exit status 1, error: pathspec 'master' did not match any file(s) known to git

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: chases2, michelle192837

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[spiffxp]

/wg naming