CASSANDRA-17507 trunk: Fix legacy clustering serialization for paging with compact storage

[adelapena]

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[pkolaczk]

Looks perfect to me! The patch makes sense, the comment explains why we need the change, the code is readable and comes with an extensive set of tests.

Don't forget to exclude the commit marked as DO NOT MERGE.

[adelapena]

@pkolaczk thanks for the review :)