init: don't suggest -reindex-chainstate for recovery on a pruned node #35849

When chainstate loading fails, init offers to rebuild the databases and, if declined, suggests restarting with -reindex or -reindex-chainstate.

On a pruned node -reindex-chainstate cannot recover: it rebuilds the chainstate by replaying existing block data, which has been pruned, and the node already rejects it with "Prune mode is incompatible with -reindex-chainstate. Use full -reindex instead." Only a full -reindex recovers a pruned node.

Omit -reindex-chainstate from the suggestion when pruning is enabled.

<!--e57a25ab6845829454e8d69fc972939a-->

The following sections might be updated with supplementary metadata relevant to reviewers and maintainers.

<!--006a51241073e994b41acfe9ec718e94-->

Code Coverage & Benchmarks

For details see: https://corecheck.dev/bitcoin/bitcoin/pulls/35849.

<!--021abf342d371248e50ceaed478a90ca-->

Reviews

See the guideline and AI policy for information on the review process.

If your review is incorrectly listed, please copy-paste <code>&lt;!--meta-tag:bot-skip--&gt;</code> into the comment that the bot should ignore.

<!--5faf32d7da4f0f540f40219e4f7537a3-->

ACK adbff4d442864061171c693d6f57b51c9d8180c8

ACK adbff4d442864061171c693d6f57b51c9d8180c8

Post-merge ACK, prune mode is incompatible with -reindex-chainstate.