Use FLEET_TOKEN_POLICY_NAME to select policy

[mtojek]

This PR enables the FLEET_TOKEN_POLICY_NAME to select the policy and prevent from using the defaulting logic.

[elasticmachine]

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• Start Time: 2022-02-15T09:46:28.365+0000

• Duration: 64 min 50 sec

Test stats 🧪

Test	Results
Failed	0
Passed	524
Skipped	1
Total	525

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[mtojek]

FYI @mdelapenya