### Elasticsearch Version

7.x, 8.x

### Installed Plugins

_No response_

### Java Version

_bundled_

### OS Version

Darwin 

### Problem Description

A data stream must have an index template that matches it in order to exist.
When managing index templates we want to make sure we don't leave a
data stream without a [corresponding index template](https://github.com/elastic/elasticsearch/blob/acf9968f9d397d755d5ad9fcf815cca23bbeda61/server/src/main/java/org/elasticsearch/cluster/metadata/MetadataIndexTemplateService.java#L918).

The `dataStreamsUsingTemplate` check uses the index pattern of the index 
templates to conclude if a template is used by a data stream, however it should
be enhanced to check the priority too as there can only be only one index template
that matches a data stream and it's the one with the highest priority.

### Steps to Reproduce

Create an ILM policy
```
PUT _ilm/policy/testing_yo
{
  "policy": {
    "phases": {
      "warm": {
	"actions": {
	  "shrink": {
          "number_of_shards": 1
	  }
        }
      }
    } 
  }
}
```

Create an index template with the `data_stream` option:
```
PUT _index_template/logs_data_stream
{
	"index_patterns": [ "logs*", "te*", "bar*" ],
	"data_stream": {},
        "priority": 100,
	"template" : {
	  "settings": {
            "index.number_of_shards": 3,
	    "index.lifecycle.name": "testing"
	  }
	}
}
```

Create the data stream
```
POST logs_test/_doc 
{
  "message": "testing",
  "@timestamp": "1591890611"
}
```

Create a new index template that would match this data stream with a higher priority
```
PUT _index_template/higher_logs_data_stream
{
	"index_patterns": [ "logs*", "te*", "bar*" ],
	"data_stream": {},
        "priority": 500,
	"template" : {
	  "settings": {
            "index.number_of_shards": 3,
	    "index.lifecycle.name": "testing"
	  }
	}
}
```

Attempt to delete the previous, lower priority index template:
```
DELETE _index_template/logs_data_stream
```

### Logs (if relevant)

_No response_
server/src/main/java/org/elasticsearch/cluster/metadata/MetadataIndexTemplateService.java
.put(IndexMetadata.SETTING_VERSION_CREATED, Version.CURRENT)
                .put(settings)
                .put(IndexMetadata.SETTING_NUMBER_OF_SHARDS, dummyShards)
                .put(IndexMetadata.SETTING_NUMBER_OF_REPLICAS, shardReplicas)
                .put(IndexMetadata.SETTING_INDEX_UUID, UUIDs.randomBase64UUID())
                .build();
            final IndexMetadata tmpIndexMetadata = IndexMetadata.builder(temporaryIndexName).settings(dummySettings).build();
            IndexService dummyIndexService = indicesService.createIndex(tmpIndexMetadata, Collections.emptyList(), false);
            createdIndex = dummyIndexService.index();
            if (mappings != null) {
                dummyIndexService.mapperService().merge(MapperService.SINGLE_MAPPING_NAME, mappings, MergeReason.MAPPING_UPDATE);
            }
        } finally {
            if (createdIndex != null) {
                indicesService.removeIndex(createdIndex, NO_LONGER_ASSIGNED, " created for parsing template mapping");
            }
        }
    }
    private void validate(String name, ComponentTemplate template) {
        validate(name, template.template(), Collections.emptyList());
    }
    private void validate(String name, ComposableIndexTemplate template) {
        validate(name, template.template(), template.indexPatterns());
    }
    private void validate(String name, Template template, List<String> indexPatterns) {
        Optional<Template> maybeTemplate = Optional.ofNullable(template);
        validate(
            name,
            maybeTemplate.map(Template::settings).orElse(Settings.EMPTY),
            indexPatterns,