test(NODE-3698): sync spec tests for crud operations with let option

[baileympearson]

Description

What is changing?

Support for the let option was added in: #2829

This PR pulls in spec changes from the following PRs:

• DRIVERS-1994 deleteOne-let, deleteMany-let, updateMany-let missing fields in events specifications#1105
• DRIVERS-1788 Support let option for CRUD commands specifications#1094
• DRIVERS-2210 Fix server versions for update*-let specifications#1150

Is there new documentation needed for these changes?

No

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>
• Changes are covered by tests
• New TODOs have a related JIRA ticket

[dariakp]

@baileympearson Did you double check that our unified test runner definitely and correctly parses the specified let option input and expectations? (I know we made the runner adjustments in the original PR, but I am a bit paranoid about these things after all the misses we've discovered after the fact, so always worth a second look)

[baileympearson]

Did you double check that our unified test runner definitely and correctly parses the specified let option input and expectations? (I know we made the runner adjustments in the original PR, but I am a bit paranoid about these things after all the misses we've discovered after the fact, so always worth a second look)

@dariakp yes, I've confirmed that the let option is being parsed as expected

[dariakp]

Just a small issue with whitespaces, otherwise LGTM