v14.2.0-canary.22

Core Changes

• fix(route-handlers): make sure preflight has CORS headers: #63264
• fix(turbopack): Remove error overlay when issue is resolved: #62983
• Disable cache in testmode: #63265
• Turbopack: app externals test case improvements: #62871
• build: Update turbopack: #63273

Misc Changes

• Update Turbopack test manifest: #63274

Credits

Huge thanks to @samcx, @kdy1, @dvoytenko, and @sokra for helping!