Temporary workaround: rename Fleet Server policy to expected default

[mtojek]

This PR renames the Fleet Service policy in Kibana to the default name, expected by the Fleet Server application. It looks like a breaking change sneaked into Fleet Server.

[elasticmachine]

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• Start Time: 2022-04-01T12:54:19.632+0000

• Duration: 31 min 32 sec

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