Fix GridReader wiring: use IParameterCallbacks instead of DynamicParameters in QueryMultiple (sync + async)#2180

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Commits on Sep 26, 2025

Refactor GridReader parameter type from DynamicParameters to IParameterCallbacks and add tests for QueryMultiple and QueryMultipleAsync to verify OnCompleted behavior.
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Refactor IParameterCallbacksTests to improve connection handling which was failing in AppVeyor.
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