v14.0.4-canary.15

Core Changes

• OpenTelemetry: propagate context to sandbox: #58791
• fix uniqueness of layers: #58872
• disable flushToDisk during generateStaticParams: #58871

Misc Changes

• Update Turbopack test manifest from GitHub Actions artifact: #58394

Credits

Huge thanks to @dvoytenko, @ForsakenHarmony, @sokra, and @ztanner for helping!