[SPARK-32406][SQL][FOLLOWUP] Make RESET fail against static and core configs #29297
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What changes were proposed in this pull request?
This followup addresses comments from #29202 (comment)
make RESET static SQL configs/spark core configs fail as same as the SET command. Not that, for core ones, they have to be pre-registered, otherwise, they are still able to be SET/RESET
add test cases for configurations w/ optional default values
Why are the changes needed?
behavior change with suggestions from PMCs
Does this PR introduce any user-facing change?
Yes, RESET will fail after this PR, before it just does nothing because the static ones are static.
How was this patch tested?
add more tests.