fix: only log auto install extension errors with debug flag

[CalebBarnes]

Clean up error logging in auto-install extensions

Problem

The auto-install extensions feature had verbose error logging that would show confusing error messages to users during normal netlify dev usage. The error handling code was also repetitive and lengthy. This is caused by resolve config running in the cli base command and working correctly, but when the dev command calls startDev from build, it is not populating the same config values that auto install extension handler expects.

I also added a try catch to the fetchAutoInstallableExtensionsMeta to gracefully fail and return an empty array if the request fails for whatever reason.

Solution

• Cleaned up error logging: Consolidated repetitive error handling
• Made error logging conditional: Error messages now only appear when the debug flag is enabled
• Improved user experience: Users no longer see confusing "Failed to auto install extension(s): Missing 'accountId'" messages during normal usage

Changes

1. Added debug parameter to AutoInstallOptions interface and handleAutoInstallExtensions function
2. Consolidated error checking into a single conditional block with cleaner logic
3. Made error logging conditional on the debug flag
4. Passed debug flag from main config resolution to auto-install function

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