tests(NODE-7533): pin NPM version & provide new configuration option to TS6 compiler

[tadjik1]

Description

Summary of Changes

Apply 2 small patches: pin NPM version on node22 to the version which it can upgrade itself into. Add new flag for running check on TS6 (which is both next and latest at the moment).

What is the motivation for this change?

Broken CI on Node22 & with TS6

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

Updates Evergreen CI configuration to stabilize Node 22 runs by pinning npm and to support TypeScript 6 “consumer-style” checks by allowing additional tsc flags to be passed through.

Changes:

• Pin NPM_VERSION for the Node 22 Evergreen task.
• Add TSC_EXTRA_FLAGS plumbing through Evergreen and use it when invoking tsc in the TypeScript check script.
• Switch the “next” TypeScript check to TS_VERSION: "next" and pass --ignoreConfig to avoid inheriting the repo tsconfig.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
.evergreen/run-typescript.sh	Passes optional extra flags to tsc invocations to support TS6-specific behavior.
.evergreen/config.yml	Pins npm for Node 22, adds TSC_EXTRA_FLAGS env wiring, and updates the TS “next” task to use TS next + --ignoreConfig.

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