[KYUUBI #3527][SPARK][FOLLOWUP] spark.kubernetes.executorEnv should be spark.executorEnv

[zwangsheng]

Why are the changes needed?

Fix bug in #3527
Modify spark.kubernetes.executorEnv to spark.executorEnv

How was this patch tested?

• Add some test cases that check the changes thoroughly including negative and positive cases if possible

• Add screenshots for manual tests if appropriate

• Run test locally before make a pull request

• Unit Test

[codecov-commenter]

Codecov Report

Merging #3591 (7254fe9) into master (612a82e) will decrease coverage by 0.05%.
The diff coverage is 100.00%.

@@ Coverage Diff @@## master #3591 +/- ##
============================================
- Coverage 51.81% 51.75% -0.06% 
Complexity 13 13 ============================================
Files 483 483 Lines 26998 26998 Branches 3769 3769 ============================================
- Hits 13988 13974 -14 - Misses 11653 11662 +9 - Partials 1357 1362 +5 

Impacted Files	Coverage Δ
...ache/kyuubi/engine/spark/SparkProcessBuilder.scala	86.66% <100.00%> (ø)
.../kyuubi/server/mysql/constant/MySQLErrorCode.scala	13.84% <0.00%> (-6.16%)	⬇️
...ache/kyuubi/server/mysql/MySQLCommandHandler.scala	75.00% <0.00%> (-4.55%)	⬇️
...ache/kyuubi/server/mysql/MySQLGenericPackets.scala	76.59% <0.00%> (-2.13%)	⬇️
...ain/scala/org/apache/kyuubi/engine/EngineRef.scala	72.26% <0.00%> (-0.85%)	⬇️
...yuubi/server/metadata/jdbc/JDBCMetadataStore.scala	89.27% <0.00%> (-0.70%)	⬇️
...he/kyuubi/ha/client/etcd/EtcdDiscoveryClient.scala	66.25% <0.00%> (-0.63%)	⬇️
...a/org/apache/kyuubi/service/TFrontendService.scala	91.17% <0.00%> (-0.30%)	⬇️

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[pan3793]

Thanks, merging to master/1.6