Fix collection error breaking integration test workflows

[bgunebakan]

Summary of the changes / Why this is an improvement

cratedb_toolkit.cfr.jobstats imports queryanonymizer at module level. That package is only declared in the cfr extra, so the six workflows installing narrow extras (DynamoDB, InfluxDB, Kinesis, MongoDB, NLSQL, PyMongo) failed during pytest.

This PR add the module-level pytest.importorskip guard.

Checklist

• Link to issue this PR refers to (if applicable): Fixes #???

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