feat: add IsTriggerAlert field to RuntimeAlert struct

[slashben]

Summary

Add IsTriggerAlert boolean field to RuntimeAlert struct to indicate whether the alert is a trigger alert.

Changes

• Added IsTriggerAlert bool field to RuntimeAlert struct in armotypes/runtimeincidents.go
• Field uses omitempty for JSON/BSON tags to maintain backward compatibility

Purpose

This field is copied from RuntimeRule.IsTriggerAlert during alert creation, allowing downstream consumers to identify trigger alerts. The field defaults to false when not present.

Backward Compatibility

• Uses omitempty tags so existing alerts without the field will continue to work
• No breaking changes to existing APIs

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