feat: Split summary counters by overrideAffected and suppress individual events for marked evaluations

[kinyoklion]

Summary

Extends the analytics event processing in LaunchDarkly.InternalSdk for override-affected evaluations, as defined by the OVERRIDE specification.

EventTypes.EvaluationEvent gains an OverrideAffected field. When it is set, the event processor produces no individual feature event and no debug event for the evaluation, whatever the flag's TrackEvents and DebugEventsUntilDate request. The evaluation is still counted in summary events, and the marker becomes part of the summary counter key, so override-affected and other evaluations of the same flag key, variation, and version accumulate into separate counters instead of being collapsed together. The summary event output writes "overrideAffected": true on a marked counter and omits the property otherwise, following the existing unknown marker. The summarizer interface carries the marker through both the aggregated and the per-context summarizers.

Nothing sets the field yet; the server SDK does so in the next change. Every existing event path is unchanged when the field is false, which the existing event processor and output tests confirm. New tests cover the suppression of feature and debug events, the suppression of a marked prerequisite record, the separate counters, and the counter serialization.

This PR is based on the branch of the override layer change so that the whole flag overrides series applies as one linear sequence; it uses nothing from that branch.

SDK-3248

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Note

Overview
Adds OverrideAffected on EvaluationEvent so override-driven evaluations follow OVERRIDE analytics rules: they still roll into summary counters but never emit feature or debug events, even when tracking or debug mode is on.

Summary aggregation now keys counters by version, variation, and overrideAffected, so marked and unmarked evaluations of the same flag do not merge. Serialized summary counters include overrideAffected: true when set (omitted otherwise). IEventSummarizer.SummarizeEvent and the aggregated/per-context summarizers pass the flag through; EventProcessorInternal applies the suppression logic. No production code sets the field in this PR (defaults false); tests cover suppression, separate counters, and JSON output.

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[kinyoklion]

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