FIO-6593: Add tests for query filter __all

[blakekrammes]

This PR adds two tests for the query filter all functionality added by this PR #138.

In Mongo, the $all query filter returns documents containing all, but not limited to, the specified query parameters.

For example, if we have some documents

[
  {
    _id: 1,
    name: "Bob",
    email: "bob@me.com",
    tags: ["one", "two", "three", "four"]
  },
  {
    _id: 2,
    name: "Mary",
    email: "mary@me.com",
    tags: ["two", "four", "five", "seven"]
  },
  {
    _id: 3,
    name: "Bill",
    email: "bill@me.com",
    tags: ["three", "four", "six", "nine"]
  }
]

and we query with $all: { tags: { $all: ["two", "four"] } }

it will return the documents with _id: 1 and _id: 2.