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### _Why are the changes needed?_
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Change the name to reflect functionalities, restore `SparkQueryTests` both on Engine&Server sides
Rename `JDBCTestUtils` to `HiveJDBCTestHelper`
Rename `BasicJDBCTests` to `SparkMetadataTests`
Rename `HiveJDBCTests` to `HiveMetadataTests`
Rename `BasicDeltaJDBCTests` to `DeltaMetadataTests`
Rename `BasicHudiJDBCTests` to `HudiMetadataTests`
Rename `BasicIcebergJDBCTests` to `IcebergMetadataTests`
Rename `KyuubiOperationGroupSuite` to `KyuubiOperationPerGroupSuite`
Rename sorts of `spark` prefixed fields in `HiveJDBCTestHelper`
Use `UserGroupInformation.createUserForTesting` for `KyuubiOperationPerGroupSuite`
Hierarchical
```
- HiveJDBCTestHelper
- DeltaMetadataTests
- [ENGINE] SparkDeltaOperationSuite
- [SERVER] DeltaOperationSuite
- HudiMetadataTests
- [ENGINE] SparkHudiOperationSuite
- [SERVER] HudiOperationSuite
- IcebergMetadataTests
- [ENGINE] SparkIcebergOperationSuite
- [SERVER] IcebergOperationSuite
- SparkMetadataTests
- [SERVER] KyuubiJdbcDriverHASuite
- HiveMetadataTests
- [ENGINE] SparkOperationSuite mixin SparkQueryTests
- [SERVER] KyuubiOperationHiveCatalogSuite
- SparkQueryTests
- [ENGINE] SparkOperationSuite mixin HiveMetadataTests
- [SERVER] KubernetesJDBCTestsSuite
- [SERVER] KyuubiOperationPerServerSuite
- [SERVER] KyuubiOperationPerGroupSuite
- [SERVER] KyuubiOperationPerUserSuite
- [SERVER] KyuubiOperationYarnClusterSuite
... other Suites for specific cases
```
### _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
- [x] [Run test](https://kyuubi.readthedocs.io/en/latest/develop_tools/testing.html#running-tests) locally before make a pull request
Closes#1287 from pan3793/ut.
Closes#1287
d9a410ca [Cheng Pan] Fix K8s tests
478a60dc [Cheng Pan] Fix scalastyle
91f2a27b [Cheng Pan] Rename BasicQueryTests to SparkQueryTests
40154223 [Cheng Pan] Rename JDBCTestHelper to HiveJDBCTestHelper
efb99110 [Cheng Pan] Use UGI createUserForTesting
d82b0635 [Cheng Pan] Reset UGI
11927101 [Cheng Pan] Refresh group mappings after update Hadoop conf
b21f36e7 [Cheng Pan] Restore lazy val user
25008ad3 [Cheng Pan] Rename `KyuubiOperationGroupSuite` to `KyuubiOperationPerGroupSuite`
d71c7e1b [Cheng Pan] Refacotor test hierarchical
Authored-by: Cheng Pan <chengpan@apache.org>
Signed-off-by: Cheng Pan <chengpan@apache.org>
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