feat(core): Pass mapDir to rewriteSourcesHook

[chargome]

• Adds a context parameter (with a mapDir property) to the rewriteSources hook, so users can resolve source paths relative to the source map's location.

ref getsentry/sentry-javascript#20028

[github-actions]

Semver Impact of This PR

🟡 Minor (new features)

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New Features ✨

• (core) Pass mapDir to rewriteSourcesHook by chargome in #908

• Use crypto.randomUUID rather than uuid by timfish in #892

Bug Fixes 🐛

• (core) Conditionally add tracing headers by chargome in #907
• (e2e-tests) Pin axios to 1.13.5 to avoid compromised 1.14.1 by andreiborza in #906
• Add missing webpack5 entrypoint in webpack-plugin by brunodccarvalho in #905

Internal Changes 🔧

• Vite integration tests by timfish in #899
• Webpack integration tests by timfish in #904
• Isolate integration test package installs by timfish in #902
• Pin GitHub Actions to full-length commit SHAs by joshuarli in #900
• Rollup integration tests by timfish in #897
• New integration tests by timfish in #896
• Remove lerna by timfish in #895
• Migrate to Vitest by timfish in #894

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[timfish]

PR is good but don't sourcemaps contain a relative path to the source files?

Or is this feature for when that is missing or wrong?

[chargome]

This is basically just a helper for users that need an anchorpoint for their relative paths like in getsentry/sentry-javascript#20028