Turbopack dev/build: Ensure serverExternalPackages applies to instrum…

…entation.ts (#68835)

## What?

After the fix in #68788 there was a report that the change doesn't
resolve the problem, turns out that's because it was importing the
package in `instrumentation.ts`.

I found that `serverExternalPackages` didn't apply to
`instrumentation.ts` in Turbopack, this PR fixes that.

Fixes
#68101 (comment)

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crates/next-core/src/next_server/context.rs

@@ -254,6 +254,7 @@ pub async fn get_server_resolve_options_context(
         ServerContextType::Instrumentation { .. } => {
             vec![
                 Vc::upcast(next_node_shared_runtime_plugin),
+                Vc::upcast(server_external_packages_plugin),
                 Vc::upcast(next_external_plugin),
             ]
         }