bun: detect and warn when orchestrion instrumented modules will be excluded from the build bundle

[isaacs]

See: #21826 (comment)

[linear-code]

JS-2894

[isaacs]

We actually do keep the instrumented modules out of the external list (that's what the test is verifying).

However, externals: ['*'] or packages: 'external' would result in the orchestrion-instrumented modules being kept out of the bundle. We should detect and warn in that case.

[github-actions]

A PR closing this issue has just been released 🚀

This issue was referenced by PR #21999, which was included in the 10.65.0 release.