[FEA] Enable ORC timestamp and decimal predicate push down tests

[thirtiseven]

Is your feature request related to a problem? Please describe.
Predicate push down doesn't work for timestamp and decimal types when reading ORC file written by GPU. This is because cuDF ORC writing does not include full Statistics. We should check if PPD works after the metrics are fixed in cuDF.

Describe the solution you'd like

• Enable the Scala tests "Support for pushing down filters for timestamp types gpu write cpu read" and "Support for pushing down filters for timestamp types gpu write gpu read" to verify that PPD works after [BUG] ORC write does not include full timestamp metrics which causes spark to not do predicate push down rapidsai/cudf#13899 been fixed.
• Enable the Scala tests "Support for pushing down filters for decimal types gpu write cpu read" and "Support for pushing down filters for decimal types gpu write gpu read" to verify that PPD works after [FEA] Create Decimal Statistics for decimal columns to enable predicate push down for spark rapidsai/cudf#13933 been fixed.

Additional context
#9068

[thirtiseven]

Test results today:

Run starting. Expected test count is: 9
OrcFilterSuite:
- Support for pushing down filters for boolean types gpu write gpu read
- Support for pushing down filters for boolean types gpu write cpu read
- Support for pushing down filters for boolean types cpu write gpu read
- Support for pushing down filters for decimal types gpu write gpu read
- Support for pushing down filters for decimal types gpu write cpu read
- Support for pushing down filters for decimal types cpu write gpu read
- Support for pushing down filters for timestamp types cpu write gpu read
- Support for pushing down filters for timestamp types gpu write cpu read *** FAILED ***
  0 was less than 10, but 10 was not less than 10 (OrcFilterSuite.scala:37)
- Support for pushing down filters for timestamp types gpu write gpu read *** FAILED ***
  0 was less than 10, but 10 was not less than 10 (OrcFilterSuite.scala:37)
Run completed in 19 seconds, 509 milliseconds.
Total number of tests run: 9
Suites: completed 2, aborted 0
Tests: succeeded 7, failed 2, canceled 0, ignored 0, pending 0
*** 2 TESTS FAILED ***

The decimal tests passed, but the timestamp tests still failed. Will check the generated files and investigate whether cuDF fixed them later.