fix(billing): Add default notification setting for trace metric bytes

Add QUOTA_TRACE_METRIC_BYTES to NOTIFICATION_SETTINGS_TYPE_DEFAULTS
so it defaults to ALWAYS, consistent with all other quota notification
types.

Refs BIL-2216
Co-Authored-By: Claude Sonnet 4 <noreply@anthropic.com>

Made-with: Cursor

Author: brendanhsentry

src/sentry/notifications/defaults.py

@@ -24,6 +24,7 @@
     NotificationSettingEnum.QUOTA_PROFILE_DURATION_UI: NotificationSettingsOptionEnum.ALWAYS,
     NotificationSettingEnum.QUOTA_SEER_BUDGET: NotificationSettingsOptionEnum.ALWAYS,
     NotificationSettingEnum.QUOTA_LOG_BYTES: NotificationSettingsOptionEnum.ALWAYS,
+    NotificationSettingEnum.QUOTA_TRACE_METRIC_BYTES: NotificationSettingsOptionEnum.ALWAYS,
     NotificationSettingEnum.QUOTA_SEER_USERS: NotificationSettingsOptionEnum.ALWAYS,
     NotificationSettingEnum.QUOTA_SIZE_ANALYSIS: NotificationSettingsOptionEnum.ALWAYS,
     NotificationSettingEnum.QUOTA_WARNINGS: NotificationSettingsOptionEnum.ALWAYS,