[SPARK-34443][CORE] Replace symbol literals with Symbol constructor invocations to comply with Scala 2.13#31569

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sarutak wants to merge 3 commits intoapache:masterfrom

sarutak:symbol-scala-2.13

Commits on Feb 15, 2021

Replace all symbol literals with Symbol constractors.
sarutak
committed

Commits on Feb 16, 2021

Fix test.
sarutak
committed
Fix test.
sarutak
committed