[CAMEL-14861] fixed bug in GooglePubsubConsumer by initialized subscribers

[taraktikos]

[ ] Make sure there is a JIRA issue filed for the change (usually before you start working on it). Trivial changes like typos do not require a JIRA issue. Your pull request should address just this issue, without pulling in other changes.
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[oscerd]

Please create also a JIRA issue, so we track this for 3.3.0 and report the issue number in the commit message

[taraktikos]

@oscerd created jira ticket https://issues.apache.org/jira/browse/CAMEL-14861

[taraktikos]

@oscerd even in the master build is failing. What I did wrong?
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-checkstyle-plugin:3.1.0:checkstyle (default-cli) on project camel-core-xml: An error has occurred in Checkstyle report generation.: Failed during checkstyle execution: There is 1 error reported by Checkstyle 8.26 with camel-checkstyle.xml ruleset. -> [Help 1]

[oscerd]

Nothing. It's not this PR.