chore(NODE-5794): add reporting for individual parallel benchmarks

[nbbeeken]

Description

What is changing?

• Currently we only have the cumulative parallel benchmarks reporting, This adds the individual tests to the report

Is there new documentation needed for these changes?

What is the motivation for this change?

• I want to see read vs write parallel performance

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

[W-A-James]

Verified that the following benchmarks are now reported individually

• LDJSON multi-file import
• LDJSON multi-file export
• GridFS multi-file upload
• GridFS multi-file download