PHOENIX-7944 (addendum) Move bcprov-jdk18on unused-declared ignore into phoenix-core pom (#2555)

The original fix added the ignore entries to the root pom's
maven-dependency-plugin config (under pluginManagement). However
phoenix-core/pom.xml re-declares the plugin under build/plugins with its
own non-empty <ignoredUnusedDeclaredDependencies> list, which overrides
(does not merge with) the parent's list. As a result the parent-level
bcprov-jdk18on entry never applied to phoenix-core, and the 2.6.0 profile
release still failed at analyze-only with:
  Unused declared: org.bouncycastle:bcprov-jdk18on:jar:1.79:test

The companion bcprov-jdk15on used-undeclared ignore kept working because
phoenix-core's <ignoredUsedUndeclaredDependencies/> is empty, so the
parent entry passed through.

Add the bcprov-jdk18on entry directly to phoenix-core's child list so the
ignore actually applies.

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

Author: lokiore

phoenix-core/pom.xml

@@ -470,6 +470,10 @@
             <ignoredUnusedDeclaredDependency>org.apache.logging.log4j:log4j-1.2-api</ignoredUnusedDeclaredDependency>
             <ignoredUnusedDeclaredDependency>org.slf4j:jul-to-slf4j</ignoredUnusedDeclaredDependency>
             <ignoredUnusedDeclaredDependency>org.slf4j:jcl-over-slf4j</ignoredUnusedDeclaredDependency>
+            <!-- bcprov is declared as bcprov-jdk18on but on some HBase profiles (e.g. 2.6.0)
+                 HBase transitively pulls the older bcprov-jdk15on, so jdk18on is reported as
+                 unused-declared. Ignore it here (this child list overrides the parent's). -->
+            <ignoredUnusedDeclaredDependency>org.bouncycastle:bcprov-jdk18on</ignoredUnusedDeclaredDependency>
           </ignoredUnusedDeclaredDependencies>
           <ignoredNonTestScopedDependencies>
             <ignoredNonTestScopedDependency>org.apache.phoenix:phoenix-core-client</ignoredNonTestScopedDependency>