bug: parameter allowEmptyValue + required interactions (via #5142)
* add failing tests
* standardize parameter keying
* validateParam test migrations
* migrate test cases to new pattern
* disambiguate name/in ordering in `body.body` test cases
* `name+in`=> `{in}.{name}`
* consider allowEmptyValue parameter inclusion in runtime validation
* use config object for all validateParam options
* drop isXml flag from validateParams
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