[SPARK-56505][SQL][TESTS] Add SparkSessionBinder to replace SharedSparkSession#56190

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fwc:sharedsparksession-refactor-mostly-nonbreaking

Commits on May 28, 2026

Add classic.SparkSessionProvider
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Move test.SharedSparkSessionBase functionality to sql.SharedSparkSession
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[API CHANGE]: Move doThreadPreAudit, doThreadPostAudit to sql.SharedSparkSession
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Rename sql.SharedSparkSession to sql.SparkSessionBinder to prevent shadowing
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Deprecate test.SharedSparkSession
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Add connect.SparkSession{Provider,Binder}, connect.QueryTest and demo
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Add classic.SparkSessionBinder with usage demonstration
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fixup: fix compile error
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Commits on May 29, 2026

Restructure so that SparkSessionBinder implements QueryTest, address nits
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fixup
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Have SharedSparkSession as empty alias of classic.SparkSessionBinder
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fixup
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