ApplicationInsights: Uses plural for operation group name

[anuchandy]

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[lmazuel]

Fine on the Python side, package is still in preview and allow breaking change. I will just mention it in the ChangeLog

[fearthecowboy]

@ericc1103 -- Operation IDs are intended to be <plural-noun>_<verb> -- this corrects a glitch in the spec. Please review and approve.

@amarzavery @vladbarosan @dsgouda @shahabhijeet -- FYI - this is technically a breaking change, but necessary to correct a bad API.

[dsgouda]

LGTM

[vladbarosan]

@fearthecowboy are we good to merge here ?