test(NODE-7464): sync backpressure getMore-retried tests to latest

[dariakp]

Description

NODE-7464

Summary of Changes

• sync backpressure getMore-retried tests to latest
• remove unnecessary template files from test directory

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

[Copilot]

Pull request overview

Syncs the client-backpressure “getMore-retried” unified spec tests with the latest upstream expectations and removes obsolete template sources from the spec directory.

Changes:

• Add useMultipleMongoses: false to relevant clients in the getMore-retried unified spec (YAML + extended JSON) to ensure deterministic behavior in sharded/LB environments.
• Normalize whitespace/formatting in getMore-retried.yml expected event blocks (no behavioral change).
• Remove unused client-backpressure YAML template files from the test/spec directory.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
test/spec/client-backpressure/getMore-retried.yml	Pins clients to a single mongos and cleans up formatting in the unified spec test.
test/spec/client-backpressure/getMore-retried.json	Mirrors the YAML entity change (useMultipleMongoses: false) in the JSON form of the same spec test.
test/spec/client-backpressure/backpressure-retry-max-attempts.yml.template	Deletes an unused generator template file from the spec directory.
test/spec/client-backpressure/backpressure-retry-loop.yml.template	Deletes an unused generator template file from the spec directory.

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