Replace _ with - in config property names

[ebyhr]

Release notes

## General
* Rename the `fault-tolerant-execution-eager-speculative-tasks-node_memory-overcommit` config property
  to `fault-tolerant-execution-eager-speculative-tasks-node-memory-overcommit`. ({issue}`23876`)

## Iceberg
* Rename the `iceberg.expire_snapshots.min-retention` config property
  to `iceberg.expire-snapshots.min-retention`. ({issue}`23876`)
* Rename the `iceberg.remove_orphan_files.min-retention` config property
  to `iceberg.remove-orphan-files.min-retention`. ({issue}`23876`)