Upgrade to Beam 2.34.0 (#1472)

This version of Beam does not have an explicit dependency on log4j.
There are a couple of other things that need to change due to the
upgrade.

1) The new version pulls in a dependency that is not on Maven Central
but on packages.confluent.io, so we need to explicitly add this repo.

2) The new version has a dependency on flogger 0.6 anb above , which removed
the LoggerConfig class (see google/flogger#142).
We therefore backported the class. In the long term we should do what
was suggested in the issue and use the normal JDK Logger config
directly.

3) The intSqlPipeline dependency graph also needs to be updated.

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java_common.gradle

@@ -63,11 +63,6 @@ configurations {
     // See https://issues.apache.org/jira/browse/BEAM-8862
     it.exclude group: 'org.mockito', module: 'mockito-core'
   }
-  all.each {
-    // log4j has high-profile security vulnerabilities. It's a transitive dependency used by some
-    // Apache Beam packages. Excluding it does not impact our troubleshooting needs.
-    it.exclude group: 'org.apache.logging.log4j'
-  }
 }
 
 dependencies {