Remove resolve fields action from read_cross_cluster (elastic#111643)

The `indices:data/read/esql/resolve_fields` action is already granted by
`read`, and therefore is not necessary to be included in
`read_cross_cluster`. Since both privileges are required for ES|QL with
CCS it's safe to omit from `read_cross_cluster`.

It was added provisionally in
elastic#110738, but there are
subtle implications that make the permissions model of ES|QL slightly
more confusing when used with aliases and indices, so this PR removes
it.

x-pack/plugin/core/src/main/java/org/elasticsearch/xpack/core/security/authz/privilege/IndexPrivilege.java

@@ -86,7 +86,6 @@ public final class IndexPrivilege extends Privilege {
         TransportClusterSearchShardsAction.TYPE.name(),
         TransportSearchShardsAction.TYPE.name(),
         TransportResolveClusterAction.NAME,
-        "indices:data/read/esql/resolve_fields",
         "indices:data/read/esql",
         "indices:data/read/esql/compute"
     );