fix(nextjs): preserve directive prologues in turbopack loaders

[igz0]

Fixes #20101.

Summary

When _experimental.turbopackApplicationKey is enabled, the Next.js Turbopack loaders inject code for metadata/value propagation.

The previous implementation relied on a regex that only handled a single directive prologue entry. For modules that start with multiple directives, such as:

"use strict";
"use client";

the injected code could end up between the directives and break the "use client" classification.

This replaces the regex-based insertion point detection with a small linear scanner that:

• skips leading whitespace and comments
• walks consecutive directive prologue entries
• returns the insertion point immediately after the last directive

Tests

• added coverage for multiple directives
• added coverage for comments between directives
• added coverage for semicolon-free directives
• added coverage for non-directive string literals that must not be skipped

Verification

Using the reproduction from #20101 with the patched @sentry/nextjs tarball:

• npm run build completes successfully
• /_not-found prerendering succeeds
• the previous TypeError: (0, g.useEffect) is not a function no longer occurs

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Semver Impact of This PR

🟢 Patch (bug fixes)

📋 Changelog Preview

This is how your changes will appear in the changelog.
Entries from this PR are highlighted with a left border (blockquote style).

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New Features ✨

Deps

• Bump lodash.template from 4.5.0 to 4.18.1 by dependabot in #20085
• Bump @xmldom/xmldom from 0.8.3 to 0.8.12 by dependabot in #20066

Other

• (core) Support embeddings in langchain by nicohrubec in #20017
• (core, node) Portable Express integration by isaacs in #19928
• (deno) Add denoRuntimeMetricsIntegration by chargome in #20023
• (node, bun) Enforce minimum collection interval in runtime metrics integrations by chargome in #20068

Bug Fixes 🐛

• (aws-serverless) Add timeout to _endSpan forceFlush to prevent Lambda hanging by logaretm in #20064
• (cloudflare) Ensure every request instruments functions by JPeer264 in #20044
• (gatsby) Fix errorHandler signature to match bundler-plugin-core API by JPeer264 in #20048

• (nextjs) Preserve directive prologues in turbopack loaders by igz0 in #20103

Internal Changes 🔧

Core

• Do not emit spans for chats.create in google-genai by nicohrubec in #19990
• Unify .do* span ops to gen_ai.generate_content by nicohrubec in #20074
• Simplify addResponseAttributes in openai integration by nicohrubec in #20013
• Extract shared endStreamSpan for AI integrations by nicohrubec in #20021
• Remove provider-specific AI span attributes in favor of gen_ai attributes in sentry conventions by nicohrubec in #20011

Deps

• Bump mshick/add-pr-comment from dd126dd8c253650d181ad9538d8b4fa218fc31e8 to e7516d74559b5514092f5b096ed29a629a1237c6 by dependabot in #20078
• Bump getsentry/craft/.github/workflows/changelog-preview.yml from 2.24.1 to 2.25.2 by dependabot in #20081

Other

• (node) Add node integration tests for Vercel ToolLoopAgent by nicohrubec in #20087
• Update validate-pr workflow by stephanie-anderson in #20072
• Remove unused tsconfig-template folder by mydea in #20067

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