test(NODE-7184): migrate integration/read-write-concern tests

[tadjik1]

Description

Summary of Changes

This PR migrates the integration tests for read-write-concern. The changes include:

• Refactor callbacks into async/await
• Import directly from the src folder, convert .js file test into .ts

Notes for Reviewers

To simplify the review process, this PR is split into 2 commits:

• change .js into .ts
• refactor test file

What is the motivation for this change?

This work is part of a larger, ongoing initiative to convert all tests to use async/await, with the ultimate goal of removing the legacy driver wrapper.

Double check the following

• Lint is passing (npm run check:lint)
• Self-review completed using the steps outlined here
• PR title follows the correct format: type(NODE-xxxx)[!]: description
  • Example: feat(NODE-1234)!: rewriting everything in coffeescript
• Changes are covered by tests
• New TODOs have a related JIRA ticket