test(NODE-6626): implement integration tests for improved client.close() - server-side

[aditi-khare-mongoDB]

Description

Add server-side resource integration tests for client.close(). These tests will remain skipped until improved client.close() is implemented.

What is changing?

• Assert server-side resource creation and clean-up upon client.close()

Is there new documentation needed for these changes?

No

What is the motivation for this change?

Improved client.close()

Release Highlight

Double check the following

• Ran npm run check:lint script
• 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

[baileympearson]

One comment about unskipping tests that pass, and some optional comments. Otherwise LGTM

The base branch was changed.

[nbbeeken]

"the server-side ServerSession is cleaned up by client.close():"

test is failing, this one we can unskip but I think the issue is something with the namespace already/not existing?

[aditi-khare-mongoDB]

@nbbeeken Error should be gone now but I'll wait for tests to pass on full CI before re-requesting review.

I'm skipping the sessions tests on versions < 4.2 since that's what the $currentOp API requires to detect idleSessions

[baileympearson]

one other comment