Get rid of unused GetFieldEvent and GettingFieldEvent

[SergeiPavlov]

Yet one hook on Field reading

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Note

Medium Risk
Touches the core field-read hot path and removes public event keys; any external subscriber to the removed hooks would break, though the PR treats them as unused.

Overview
Removes the Getting field and Get field extension points from the entity/structure field read pipeline, leaving only the pre-read work in SystemBeforeGetValue (fetch, session checks, debug logging).

EntityEventBroker no longer exposes GettingFieldEventKey or GetFieldEventKey. Subscriber dispatch for those keys is deleted from Entity and Structure, and the abstract SystemGetValue<T> hook is removed from Persistent along with all post-read invocations in GetNormalizedFieldValue and GetReferenceKey. Field set events (SettingField*, SetField*) are unchanged.

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[cursor]

Required field-get subscriptions removed

Medium Severity

This change removes entity-level field-get subscriptions (GettingFieldEventKey and GetFieldEventKey), so EntityEventBroker subscribers no longer run when a field is read. Those entity-level get subscriptions remain required, even after session field-get events were removed.

Additional Locations (2)

• Orm/Xtensive.Orm/Orm/EntityEventBroker.cs#L20-L26
• Orm/Xtensive.Orm/Orm/Structure.cs#L177-L184

 

^{Triggered by learned rule: No session event on entity field get}

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