Set MONGOMS_DOWNLOAD_URL env var for backend tests in package.json

[rendall]

Motivation

• Ensure the backend Jest tests use a specific MongoDB binary download URL to avoid flaky or blocked downloads during test runs.

Description

• Update the test:backend npm script to prefix the Jest invocation with cross-env MONGOMS_DOWNLOAD_URL=https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-ubuntu2204-6.0.14.tgz so the memory MongoDB downloader uses the specified binary.

Testing

• Ran yarn test:backend which executed the backend Jest suite and completed successfully.

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