### What changes were proposed in this pull request?
Add database if exists check in `SeesionCatalog`
### Why are the changes needed?
Curently execute `drop database test` will throw unfriendly error msg.
```
Error in query: org.apache.hadoop.hive.metastore.api.NoSuchObjectException: test
org.apache.spark.sql.AnalysisException: org.apache.hadoop.hive.metastore.api.NoSuchObjectException: test
at org.apache.spark.sql.hive.HiveExternalCatalog.withClient(HiveExternalCatalog.scala:112)
at org.apache.spark.sql.hive.HiveExternalCatalog.dropDatabase(HiveExternalCatalog.scala:200)
at org.apache.spark.sql.catalyst.catalog.ExternalCatalogWithListener.dropDatabase(ExternalCatalogWithListener.scala:53)
at org.apache.spark.sql.catalyst.catalog.SessionCatalog.dropDatabase(SessionCatalog.scala:273)
at org.apache.spark.sql.execution.command.DropDatabaseCommand.run(ddl.scala:111)
at org.apache.spark.sql.execution.command.ExecutedCommandExec.sideEffectResult$lzycompute(commands.scala:75)
at org.apache.spark.sql.execution.command.ExecutedCommandExec.sideEffectResult(commands.scala:73)
at org.apache.spark.sql.execution.command.ExecutedCommandExec.executeCollect(commands.scala:84)
at org.apache.spark.sql.Dataset.$anonfun$logicalPlan$1(Dataset.scala:228)
at org.apache.spark.sql.Dataset.$anonfun$withAction$1(Dataset.scala:3707)
```
### Does this PR introduce _any_ user-facing change?
Yes, more cleaner error msg.
### How was this patch tested?
Add test.
Closes#32768 from ulysses-you/SPARK-35629.
Authored-by: ulysses-you <ulyssesyou18@gmail.com>
Signed-off-by: Gengliang Wang <gengliang@apache.org>
c7fb0e18be