test(NODE-7433): sync fle2v2-InsertFind-keyAltName unified spec test

[tadjik1]

Description

Summary of Changes

Vendors the fle2v2-InsertFind-keyAltName unified spec test from the specifications repo into the driver. This test verifies that keyAltName can be specified in encryptedFieldsMap fields for Queryable Encryption — libmongocrypt translates the keyAltName to keyId transparently, so no driver code changes are required.

Requires libmongocrypt ≥ 1.18.0 (landed via NODE-7569).

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

[Copilot]

Pull request overview

Vendors the fle2v2-InsertFind-keyAltName Queryable Encryption (FLE2v2) unified spec test into the Node.js driver’s spec test fixtures, validating that keyAltName can be provided in encryptedFieldsMap and is translated by libmongocrypt during command construction.

Changes:

• Added a new unified spec test fixture covering insert/find behavior with an indexed encrypted field configured via keyAltName.
• Added a new unified spec test fixture covering createCollection behavior where keyAltName is translated to keyId.
• Gated execution via runOnRequirements to require MongoDB server >= 7.0.0 and libmongocrypt >= 1.18.0.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
test/spec/client-side-encryption/tests/unified/fle2v2-InsertFind-keyAltName.yml	Adds the upstream YAML unified spec test definition for keyAltName translation coverage.
test/spec/client-side-encryption/tests/unified/fle2v2-InsertFind-keyAltName.json	Adds the JSON form consumed by the unified spec runner for the same test scenarios.