[SPARK-56744][INFRA] Document test base class hierarchy in AGENTS.md#55707

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zhengruifeng:add-test-base-class-guide

Commits on May 6, 2026

[INFRA] Document test base class hierarchy in AGENTS.md
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[INFRA] Document session providers (TestHiveSingleton, RemoteSparkSession) in AGENTS.md
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[INFRA] Note that RemoteSparkSession is non-SparkFunSuite-based in AGENTS.md
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[INFRA] Document SparkTestSuite as style-agnostic foundation in AGENTS.md
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[INFRA] Remove RemoteSparkSession from session-provider table in AGENTS.md
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[INFRA] Fix test-base-class chain diagram in AGENTS.md
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[INFRA] Show PlanTestBase / QueryTestBase chain in AGENTS.md
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[INFRA] Trim redundant-mixin and manual-session sections from AGENTS.md
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[INFRA] Lead with style-agnostic helper traits in AGENTS.md
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[INFRA] Rename Test Base Classes section to Scala-specific in AGENTS.md
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Commits on May 7, 2026

[INFRA] Drop style-agnostic *Base chain from AGENTS.md per review
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