[v25.2.x] CORE-14617 kafka: fix fetch session retry losing partition inclusion#29363
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When fetches retry internally due to min_bytes not being satisfied, partitions with changed metadata were incorrectly excluded from the response. The issue was that update_fetch_partition() both checked whether a partition should be included AND mutated the session cache. On retry, the cache already reflected the response, so no change was detected. Split into partition_has_changes() for the check in set() and update_session_partition() for the mutation in send_response(). Also re-enables the source_high_watermark check in cluster linking tests. (cherry picked from commit b7c6970)
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Backport of PR #29304
The conflict was on the cluster linking test + the nearby
fetch_response_bytes_eq_unitstest infetch_test.ccnot existing on v25.2.x.Fixes #29350