BCI-3619 Fix TestHeadTracker_CallsHeadTrackableCallbacks flaky test

[dhaidashenko]

Fixed HeadTracker's flaky test TestHeadTracker_CallsHeadTrackableCallbacks.

gomega by default uses 1s timeout for Eventually assertion. HeadTracker by default has 1s heads sampling interval, which delays fulfilment of the assertion.

[cl-sonarqube-production[bot]]

Quality Gate passed

Issues
0 New issues
0 Fixed issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

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