Remove documentValidationFailureCode from integration test.

[chilagrow]

What should be done?

documentValidationFailureCode is used to skip tigris test in compat test. We want to remove this. But this might not be simple.

For example, an operator that update the value like bson.D{{"$set", bson.D{{"v", int32(42)}}}} would pass on Int32s provider on tigris but fail on all other providers, because tigris schema won't be the right one for other ones.
We need to think of a setup to only run tigris test on specific provider. It kind of feels like we may need to set tigris schema per test case.

Where?

documentValidationFailureCode

Definition of Done

• integration/compatibility tests added/updated;
• spot refactorings done;