Stratconn 2695 eliminate 403 missing scopes errors

[hvardhan-unth]

Over the last 30 days, 1.3% of the app's API calls (2M) resulted in 403 errors. All of these are due to some 59 portals missing the analytics.behavioral_events.send scope necessary to access the Custom Behavioral Events API (POST /events/v3/send). So, in this PR applied check on access-token for a scope for Custom behavioural event action when user perform the action.

JIRA ticket link:- https://segment.atlassian.net/browse/STRATCONN-2695

Testing

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• [x] Tested end-to-end using the local server