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Pursuant to discussion regarding #4699, turn on `misc-non-private-member-variables-in-classes` using the `IgnoreClassesWithAllMemberVariablesBeingPublic` flag (the check treats structs as classes, so we need this for structs with all-public members). Updates the style guide notes to match, which should be pretty minor due to the scoping of test fixtures. Also fixes some underscore uses in test files on the way. Basically this is keeping the style for [class data member naming](https://google.github.io/styleguide/cppguide.html#Variable_Names) even while making them public.