Change the behaviour of not-in and != when convert standard query to pipeline

[cherylEnkidu]

#no-changelog
porting from googleapis/nodejs-firestore@4f4abbe#diff-ffda714ef8ea716c042da34cf8c06653825330baaabb9b14f2972a4dc1f7c648R779

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[MarkDuckworth]

The problem with filtering out all inequality fields is if the field is in an explicit order by

// This should have existence check on 'a'
q = db.collection('b').where('a', '!=', 0).orderBy('a')

// This should not have existence check on 'a'
q = db.collection('b').where('a', '!=', 0)

[MarkDuckworth]

Double check my logic on that