Add completions tests for MongogoDB Native Types on composite types `type`

[Jolg42]

Found during a PR review in https://github.com/prisma/language-tools/pull/1353#pullrequestreview-1250396352

We should add tests (currently none)

[Jolg42]

I think one example would be to test

photos String |

There we have a suggestion for @db Then after adding a . 2 new suggestions

• ObjectId
• String

For an Int field

• Long
• Int