fix: support virtual entrypoints in onResolve()

[alii]

What does this PR do?

Fixes #9862
Fixes #20806

How did you verify your code works?

added some tests

[robobun]

^{Updated 4:00 PM PT - Aug 26th, 2025}

❌ @alii, your commit 3bc07b9 has 5 failures in Build #23976:

• test/js/sql/sql-mysql.test.ts - timeout on 🍎 14 aarch64
• test/js/third_party/body-parser/express-memory-leak.test.ts - timeout on 🐧 12 x64-asan
• test/js/web/request/request-clone-leak.test.ts - timeout on 🐧 12 x64-asan
• test/js/node/test/parallel/test-worker-memory.js - code 1 on 🍎 14 aarch64
• test/js/bun/shell/shell-load.test.ts - 1 failing on 🍎 13 aarch64
• test/js/bun/shell/shell-load.test.ts - 1 failing on 🐧 12 x64-asan
• test/js/bun/shell/shell-load.test.ts - 1 failing on 🍎 14 x64
• test/js/bun/shell/shell-load.test.ts - 1 failing on 🐧 24.04 x64-baseline
• test/js/bun/shell/shell-load.test.ts - 1 failing on 🐧 12 x64
• test/js/bun/shell/shell-load.test.ts - 1 failing on 🐧 24.04 x64
• test/js/bun/shell/shell-load.test.ts - 1 failing on 🍎 13 x64

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🧪   To try this PR locally:

bunx bun-pr 22144

That installs a local version of the PR into your bun-22144 executable, so you can run:

bun-22144 --bun