[AI-FSSDK] [FSSDK-12958] Continue rule evaluation after local holdout hit

[alexjoeyyong]

Summary

Previously, a local holdout hit returned the holdout variation right away and skipped every remaining rule. Now a local holdout hit only removes the user from that rule. Evaluation continues with the next rule, and a holdout event is sent for each hit.

Changes

• A local holdout hit on an experiment or delivery rule skips only that rule, then evaluation continues (no jump to Everyone Else)
• The decide path sends one holdout impression per local holdout hit, whatever sendFlagDecisions is set to; DISABLE_DECISION_EVENT still suppresses them
• The decision result now carries a list of holdout decisions; the existing single holdout decision field is kept (deprecated, holds the first hit)
• Legacy APIs skip held-out rules without sending holdout events

Jira Ticket

FSSDK-12958