[7.x] Move some constants from SearchableSnapshotsConstants to server #75365
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Elasticsearch's server sometimes has to do things
differently in order to handle searchable snapshots
shards. In such cases it relies on index settings
and hard coded values to know if a shard is a
searchable snapshot one.
This commit adds a new SearchableSnapshotsSettings
class in server that provides methods to check if
an index is a searchable snapshot index. This class
also contains the names of some index settings
related to searchable snapshots that are required
by the server.
Backport of #75308