[SPARK-34498][SQL][TESTS] fix the remaining problems in #31560#31621

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kevincmchen wants to merge 3 commits intoapache:masterfrom

kevincmchen:SPARK-34498

Commits on Feb 23, 2021

fix the remaining problems in SPARK-34432.
kevincmchen
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Commits on Mar 1, 2021

extend TestingV2Source instead of SimpleTableProvider
kevincmchen
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Commits on Mar 2, 2021

it's unnecessary to override readSchema in MyScanBuilder and schema in MyTable, so delete these.
kevincmchen
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