### Description

**Background**
As part of https://github.com/elastic/kibana/issues/104986 we will be adding the ability for Elastic Agents to send agent monitoring data to a remote Elasticsearch cluster. In order to achieve this, we will need a service token for the remote cluster which fleet server will use. 

This service account will need less permissions than the `elastic/fleet-server` as integration data will not be sent to remote clusters yet.

**Service Account Details**

Name: `elastic/fleet-server-remote`

Permissions:
-  for indices `logs-*`, `metrics-*` privileges "write", "create_index", "auto_configure"

x-pack/plugin/security/src/test/java/org/elasticsearch/xpack/security/authc/service/ServiceAccountServiceTests.java
appender.assertAllExpectationsMatched();
            
            appender.addExpectation(
                new MockLogAppender.SeenEventExpectation(
                    "no colon",
                    ServiceAccountToken.class.getName(),
                    Level.TRACE,
                    "failed to extract qualified service token name and secret, missing ':'"
                )
            );
            final SecureString bearerString2 = createBearerString(
                List.of(magicBytes, randomAlphaOfLengthBetween(30, 50).getBytes(StandardCharsets.UTF_8))
            );
            assertNull(ServiceAccountService.tryParseToken(bearerString2));
            appender.assertAllExpectationsMatched();
            
            appender.addExpectation(
                new MockLogAppender.SeenEventExpectation(
                    "invalid delimiter for qualified name",
                    ServiceAccountToken.class.getName(),
                    Level.TRACE,
                    "The qualified name of a service token should take format of 'namespace/service_name/token_name'"
                )
            );
            if (randomBoolean()) {
                final SecureString bearerString3 = createBearerString(
                    List.of(
                        magicBytes,
                        (randomAlphaOfLengthBetween(10, 20) + ":" + randomAlphaOfLengthBetween(10, 20)).getBytes(StandardCharsets.UTF_8)
                    )