[SPARK-56111][CORE] Add SparkContext.isDriver() and use it across the codebase#54922

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cloud-fan:SPARK-53915-followup

Commits on Mar 20, 2026

[MINOR] Use SparkContext.isDriver() in GlobalSingletonManualClock
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[MINOR] Add SparkContext.isDriver() and use it across the codebase
cloud-fan
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