Drop @ignore'd Calcite ITs from CalciteNoPushdownIT @suite (opensearch-project#5416)

Mirrors the trailing portion of opensearch-project#5414 onto
feature/mustang-ppl-integration. The Gradle 9.4.1 wrapper bump (opensearch-project#5406)
and the integTest exclude block for @ignore'd classes (opensearch-project#5407) already
landed on this branch, but the matching cleanup of `CalciteNoPushdownIT`
did not — the @suite still listed four classes that are now build-time
excluded from integTest:

  - CalciteInformationSchemaCommandIT
  - CalciteJsonFunctionsIT
  - CalcitePrometheusDataSourceCommandsIT
  - CalciteShowDataSourcesCommandIT

Leaving them in the suite means the JUnit runner attempts to load each
class, finds it referenced from the suite, and registers a descriptor —
which (combined with the class-level @ignore) reproduces the same
TestEventReporterAsListener.started cast that the integTest exclude was
meant to avoid. Dropping the entries here keeps the no-pushdown suite
consistent with the exclude block: a class excluded at the build layer
must not also appear in any @Suite.SuiteClasses list.

No new tests are introduced or removed — the four classes are already
@ignore'd and have been since they were written. This change is purely
about keeping the no-pushdown suite metadata aligned with the exclusion
pattern carried over from main.

Signed-off-by: Kai Huang <ahkcs@amazon.com>

Author: ahkcs

integ-test/src/test/java/org/opensearch/sql/calcite/CalciteNoPushdownIT.java

@@ -43,10 +43,8 @@
   CalciteGeoIpFunctionsIT.class,
   CalciteGeoPointFormatsIT.class,
   CalciteHeadCommandIT.class,
-  CalciteInformationSchemaCommandIT.class,
   CalciteIPComparisonIT.class,
   CalciteIPFunctionsIT.class,
-  CalciteJsonFunctionsIT.class,
   CalciteLegacyAPICompatibilityIT.class,
   CalciteLikeQueryIT.class,
   CalciteMathematicalFunctionIT.class,
@@ -88,7 +86,6 @@
   CalcitePPLSortIT.class,
   CalcitePPLStringBuiltinFunctionIT.class,
   CalcitePPLTrendlineIT.class,
-  CalcitePrometheusDataSourceCommandsIT.class,
   CalciteQueryAnalysisIT.class,
   CalciteRareCommandIT.class,
   CalciteRegexCommandIT.class,
@@ -99,7 +96,6 @@
   CalciteResourceMonitorIT.class,
   CalciteSearchCommandIT.class,
   CalciteSettingsIT.class,
-  CalciteShowDataSourcesCommandIT.class,
   CalciteSortCommandIT.class,
   CalciteStatsCommandIT.class,
   CalciteSystemFunctionIT.class,