[8.0](backport #28993) [Elastic-Agent] Use internal port for local fleet server

[mergify]

This is an automatic backport of pull request #28993 done by Mergify.

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[elasticmachine]

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• Start Time: 2021-12-07T18:21:19.179+0000

• Duration: 11 min 52 sec

• Commit: 2ad47f8

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[michalpristas]

/test