### Elasticsearch Version

8.x

### Installed Plugins

_No response_

### Java Version

_bundled_

### OS Version

Any

### Problem Description

ILM [SwapAliasesAndDeleteSourceIndexStep](https://github.com/elastic/elasticsearch/blob/ffcf0eac010df3b5ba7989c5dd87bf362dd0d311/x-pack/plugin/core/src/main/java/org/elasticsearch/xpack/core/ilm/SwapAliasesAndDeleteSourceIndexStep.java) doesn't play nicely with with hidden aliases. 

When we copy the aliases from the source index in the move step, we do not copy the is_hidden value.

This can lead to permanently bad ILM state with an error like:

```
policy [kibana-event-log-policy] for index [.kibana-event-log-7.11.1-000044] failed on step [{"phase":"frozen","action":"searchable_snapshot","name":"swap-aliases"}]. Moving to ERROR step java.lang.IllegalStateException: alias [.kibana-event-log-7.11.1] has is_hidden set to true on indices [...]; alias must have the same is_hidden setting on all indices at org.elasticsearch.cluster.metadata.Metadata$Builder.validateAlias(Metadata.java:2089) 
```

### Steps to Reproduce

Combination of ILM and hidden aliases.

### Logs (if relevant)

_No response_
x-pack/plugin/core/src/test/java/org/elasticsearch/xpack/core/ilm/SwapAliasesAndDeleteSourceIndexStepTests.java
randomStepKey(),
                client,
                targetIndexPrefix
            );
            IndexMetadata.Builder targetIndexMetadataBuilder = IndexMetadata.builder(targetIndexName)
                .settings(settings(Version.CURRENT))
                .numberOfShards(randomIntBetween(1, 5))
                .numberOfReplicas(randomIntBetween(0, 5));
            ClusterState clusterState = ClusterState.builder(emptyClusterState())
                .metadata(Metadata.builder().put(sourceIndexMetadata, true).put(targetIndexMetadataBuilder).build())
                .build();
            step.performAction(sourceIndexMetadata, clusterState, null, ActionListener.noop());
        }
    }
    private NoOpClient getIndicesAliasAssertingClient(List<AliasActions> expectedAliasActions) {
        return new NoOpClient(getTestName()) {
            @Override
            protected <Request extends ActionRequest, Response extends ActionResponse> void doExecute(
                ActionType<Response> action,
                Request request,
                ActionListener<Response> listener
            ) {
                assertThat(action.name(), is(IndicesAliasesAction.NAME));
                assertTrue(request instanceof IndicesAliasesRequest);
                assertThat(((IndicesAliasesRequest) request).getAliasActions(), equalTo(expectedAliasActions));
            }
        };
    }
}