Filter non-actionable Non-Error promise rejection errors from Sentry

[iHiD]

Closes #8454

Summary

• Add a filter in the Sentry beforeSend callback to drop Non-Error promise rejection captured with value: errors
• These are unhandled promise rejections where a non-Error value (e.g. a plain string) was rejected, producing no stack trace and no actionable information
• Follows the same pattern as all existing Sentry error filters in react-bootloader.tsx

Test plan

• Verified the filter string matches the exact Sentry SDK synthetic message format
• Confirmed the filter follows the established pattern of all other filters in beforeSend
• yarn test passes (160/160 suites, 1550/1550 tests)

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