Revert "Add net autoselectfamily default test (#19970)"

[190n]

What does this PR do?

This reverts PR #19970 since it seems to be the one that broke test-http-pipeline-requests-connection-leak:

• it failed on that PR: https://buildkite.com/bun/bun/builds/17526
• it passed in node:net rework #18962 (https://buildkite.com/bun/bun/builds/17511) which was the immediate parent of that PR

(The diff on net.ts here is smaller than in #19970 since the rest of #19970 was already reverted in #20002)

How did you verify your code works?

Will see what CI says

[robobun]

^{Updated 2:53 PM PT - May 29th, 2025}

❌ @190n, your commit b500e10 has 3 failures in Build #17638:

• test/js/node/test/parallel/test-http-pipeline-requests-connection-leak.js - timeout on 🍎 13 aarch64
• test/js/bun/spawn/spawn.test.ts - 1 failing on 🪟 2019 x64
• test/js/bun/spawn/spawn.test.ts - 1 failing on 🪟 2019 x64-baseline
• test/js/bun/net/tcp.test.ts - code STATUS_HEAP_CORRUPTION on 🪟 2019 x64-baseline

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🧪   To try this PR locally:

bunx bun-pr 20028

That installs a local version of the PR into your bun-20028 executable, so you can run:

bun-20028 --bun

[190n]

Never mind, it failed on this too so I was wrong about what caused this.

It does seem to have been flaky even since before #18962. For example it timed out here: https://buildkite.com/bun/bun/builds/16783.