CNDB-16307: respect storage compatibility mode when dispatching hints

[driftx]

What is the issue

After CNDB-16249, hints are written with the storage-compatible messaging version (e.g., VERSION_40), but dispatch was still using the peer's negotiated version (VERSION_DS_20). This mismatch forced hints to be decoded and re-encoded on dispatch, which fails when the tenant is unassigned because tables are unknown.

What does this PR fix and why was it fixed

Cap the dispatch version to the storage compatibility mode's version so hints can use the encoded path (no deserialization) when the versions match.

[github-actions]

Checklist before you submit for review

• This PR adheres to the Definition of Done
• Make sure there is a PR in the CNDB project updating the Converged Cassandra version
• Use NoSpamLogger for log lines that may appear frequently in the logs
• Verify test results on Butler
• Test coverage for new/modified code is > 80%
• Proper code formatting
• Proper title for each commit staring with the project-issue number, like CNDB-1234
• Each commit has a meaningful description
• Each commit is not very long and contains related changes
• Renames, moves and reformatting are in distinct commits
• All new files should contain the DataStax copyright header instead of the Apache License one

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[cassci-bot]

❌ Build ds-cassandra-pr-gate/PR-2176 rejected by Butler

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6 regressions found
See build details here

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Found 6 new test failures

Test	Explanation	Runs	Upstream
o.a.c.cql3.validation.operations.AggregationQueriesTest.testAggregationQueryShouldNotTimeoutWhenItExceedesReadTimeout (compression)	NEW	🔴	2 / 26
o.a.c.index.SecondaryIndexManagerTest.testIndexRebuildWhenAddingSStableViaRemoteReload (compression)	NEW	🔴	20 / 26
o.a.c.index.sai.cql.VectorCompaction100dTest.testCompactionWithEnoughRowsForPQAndDeleteARow[db true] ()	NEW	🔴	0 / 26
o.a.c.repair.FailedAckTest.failedAck ()	NEW	🔴	0 / 26
o.a.c.repair.FailingRepairFuzzTest.failingRepair ()	NEW	🔴	0 / 26
o.a.c.repair.SlowMessageFuzzTest.slowMessages (compression)	NEW	🔴	0 / 26

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Found 3 known test failures

[djatnieks]

Would these improvements make sense in Apache C* 5.0 too?

[djatnieks]

Is this expected to fix the HintedHandoff test in CNDB (seems like it)?

[driftx]

Would these improvements make sense in Apache C* 5.0 too?

Maybe all of CNDB-16249 once I finish fixing the bugs.

Is this expected to fix the HintedHandoff test

Yep!