test(integ-test): exclude AnalyticsEngineCompatIT from the main integTest task (#5502)

AnalyticsEngineCompatIT (package org.opensearch.sql.plugin) is a smoke test
that only makes sense against a cluster bundling the analytics-engine plugin
stack. It is provisioned and run by the dedicated :analyticsEngineCompatIT
task (testClusters.analyticsEngineCompat), which adds arrow-base,
arrow-flight-rpc and analytics-engine.

The main integTest task selects tests by exclusion and excluded
org/opensearch/sql/security/** ("executed in another task") but never
excluded this smoke test, so it also ran against the plain
integTest/remoteCluster (neither of which has analytics-engine). There it is
useless and exposed to suite-wide infra flakiness; in a recent CI run it was
the descriptor recorded as failed after the test JVM wedged for ~4.5h.

Exclude the specific AnalyticsEngineCompatIT class, matching the per-class
exclude style already used in this task (e.g. legacy/ExplainIT.class).

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

Author: ahkcs

integ-test/build.gradle

@@ -726,6 +726,12 @@ integTest {
     // Exclude this IT, because they executed in another task (:integTestWithSecurity)
     exclude 'org/opensearch/sql/security/**'
 
+    // Exclude the analytics-engine smoke test, because it executes in another task
+    // (:analyticsEngineCompatIT) against a cluster that bundles the analytics-engine plugin
+    // stack. Running it here against the plain integTest/remoteCluster (no analytics-engine)
+    // is pointless and leaves it exposed to suite-wide infra flakiness.
+    exclude 'org/opensearch/sql/plugin/AnalyticsEngineCompatIT.class'
+
     // Workaround for Gradle 9.4.1 ClassCastException in TestEventReporterAsListener.started
     // (line 58) — the bridge casts a parent test descriptor's reporter to
     // GroupTestEventReporterInternal but a class-level @Ignore produces a non-composite parent