fix(NODE-3711): retry txn end on retryable write

[durran]

Description

The driver was retrying commitTransaction and abortTransaction but previously failing 4 spec tests that were tricking the driver to base retries on these commands on error code. The retryable writes spec defines the specific errors that are retryable, and the transactions spec states these 2 commands must adhere to that specification. The fact that an operation is retryable is stated as:

When connected to a MongoDB instance that supports retryable writes (versions 3.6+), the driver MUST treat all errors with the RetryableWriteError label as retryable.

Note that the ticket was scoped to these two commands only, so the full gambit of retryable writes was not touched. There is a ticket to address that in NODE-3769.

What is changing?

This adds a new check for for if a transaction command can be retried, isRetryableEndTransactionError, which bases this solely on if the error contains a "RetryableWriteError" and does not look at the error code.

Is there new documentation needed for these changes?

No

What is the motivation for this change?

NODE-3711

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]

Just have a question to clarify the intent of the implementation, otherwise LGTM