feat(mongodb-runner): remove support for 4.2 servers

[nbbeeken]

Description

Copying the driver notification here:

Support for MongoDB 4.2 is removed

Warning

When the driver connects to a MongoDB server of version 4.2 or less, it will now throw an error.

In order to update the nodejs driver used in mongodb-runner then this package also needs to drop support.

Open Questions

https://www.mongodb.com/legal/support-policy/lifecycles

Checklist

• I have signed the Contributor License Agreement (https://www.mongodb.com/legal/contributor-agreement)
• New tests and/or benchmarks are included
• Documentation is changed or added

[Copilot]

Pull request overview

This PR updates mongodb-runner to drop compatibility paths for MongoDB 4.2 by removing legacy (pre-structured logging) parsing logic and removing integration tests that spin up 4.2 via docker.

Changes:

• Removed port/buildInfo extraction logic that relied on 4.2-era (logv1) plaintext log messages.
• Deleted Linux-only docker integration tests that validated spawning MongoDB 4.2.x topologies.
• Kept only structured-log (logv2) IDs as the supported mechanism for port/buildInfo discovery.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
packages/mongodb-runner/src/mongologreader.ts	Removes 4.2-era logv1 parsing branches for port/build info extraction; leaves only logv2-id based parsing.
packages/mongodb-runner/src/mongocluster.spec.ts	Removes docker-based integration tests that exercised MongoDB 4.2.x clusters.

Suppressed comments (1)

packages/mongodb-runner/src/mongocluster.spec.ts:367

• Now that the 4.2 docker-based integration tests are removed, there is no longer a regression test that verifies MongoDB 4.2 (and earlier) is rejected with a clear error. Since this PR’s purpose is to drop 4.2 support, please add a test that MongoCluster.start({ version: '4.2.x', ... }) fails with an explicit "MongoDB <= 4.2 is not supported"-style message (ideally thrown before download/spawn).

  it('can spawn a 6.x enterprise standalone mongod', async function () {
    if (
      (process.platform === 'win32' || process.platform === 'linux') &&
      process.env.CI
    ) {

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