build: Skip clirr check for downstream libraries (#4062)

The downstream libraries' clirr check are failing due to protobuf rc
release. For example,
[java-bigtable](googleapis/java-bigtable#2737).
Skipping clirr check in sdk-platform-java-config so we don't have to
skip it for each downstream library. We should re-enable them after
protobuf upgrade is completed.

Co-authored-by: Diego Marquez <diegomarquezp@google.com>

Author: blakeli0

sdk-platform-java-config/pom.xml

@@ -18,5 +18,7 @@
 
     <properties>
         <google-cloud-shared-dependencies.version>3.55.1-SNAPSHOT</google-cloud-shared-dependencies.version> <!-- {x-version-update:google-cloud-shared-dependencies:current} -->
+        <!--  skipping clirr check for protobuf 4.x upgrade for downstream libraries -->
+        <clirr.skip>true</clirr.skip>
     </properties>
 </project>