[MAIN] [STRATCONN] 4261 Mixpanel Multistatus support (#2536)

* Added multistatus support for mixpanel

* code formated: Mixpanel multistatus

* Code Refactored: Mixpanel

* Unit test cases added for mixpanel multistatus

* Unit test cases refactored

* Added code to test on stage

* Added code to test on stage

* Handled error response

* Added body and sent on 400 error

* Removed hard code value

* Code refactored

* Code refactored

* code refactored

* Features fag added for mixpanel

* Updated flagon for mixpanel

* Removed console logs

* Added feature flag in api response of mixpanel

* Added feature flag in api response of mixpanel