[JENKINS-69442] Defer query of change file paths until actually required

[chrisa-arm]

The change based event payload includes enough information to
determine if the project, branch and topic match the configured
trigger definition. These should always be tested first before
checking any file path filters since that requires fetching the
list of files for the change from the Gerrit server.

This fix also removes unnecessary multiple loops over the file path
trigger filters for each branch filter. The branch and file path
filters in a given trigger definition are independent of each of other.

https://issues.jenkins.io/browse/JENKINS-69442

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