test(NODE-7182): migrate integration/connection-monitoring-and-pooling tests

[tadjik1]

Description

Summary of Changes

This PR migrates the integration tests for connection-monitoring-and-pooling. The changes include:

• Replacing callbacks with async/await for one test.
• Import directly from the src folder.

Notes for Reviewers

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

• The first commit converts callbacks to async/await.
• Other commits contains the remaining refactoring changes (imports).

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