fix(types): support using UpdateQuery in bulkWrite()

[vkarpov15]

Fix #12595
Re: #11911

Summary

Not my favorite change, but unfortunately necessary if we want to support #12595 with extends Document. Once we drop support for extends Document, we can revisit this issue. See comments about why this change is necessary.

Examples

import mongoose, { UpdateQuery } from 'mongoose';
const { Schema, model } = mongoose;

async function run() {
  await mongoose.connect('mongodb://localhost:27017/test');

  interface IAnimal {
    name?: string;
  }

  const animalSchema = new Schema<IAnimal>({
    name: { type: String }
  });

  const Animal = model<IAnimal>('Animal', animalSchema);

  const writeOperations = ['foo', 'bar', 'baz'].map(name => {
    const changes: UpdateQuery<IAnimal> = { }

    if (name === 'foo') {
      changes.name = name.repeat(2);
    } else {
      changes.name = name.repeat(4);
    }

    return {
      updateOne: {
        filter: { name },
        update: changes
      }
    }
  })

  await Animal.bulkWrite(writeOperations);
}
run();

[hasezoey]

LGTM