panel: drop custom ERP5Site_receiveGoogleCallback

See merge request !642
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Status Job ID Name Coverage
  External
failed SlapOS-Master.UnitTest-Master

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failed SlapOS.Eggs.UnitTest-Master.Python2

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passed SlapOS-Master.UnitTest-Master

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passed SlapOS.Eggs.UnitTest-Master.Python2

passed SlapOS.Eggs.UnitTest-Master.Python2

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passed SlapOS.Eggs.UnitTest-Master.Python2

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failed SlapOS.Eggs.UnitTest-Master.Python3