Use different feature flag for Flow Triggers Composite ID

Igor Drozdovrequested to merge
id-use-ff-for-ai-flow-triggers-composite-identity into master

What does this MR do and why?

So we can enable it independently from Duo Workflow Composite Identity

Related issue: https://gitlab.slack.com/archives/C101F3796/p1760370338137899?thread_ts=1760370081.089269&cid=C101F3796

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