partially revert "[git] remove unused Git.LogContextMenu group"
partially revert "[git] remove unused Git.LogContextMenu group"

Since there are plugins that still use Git.LogContextMenu in oder to work for older IDE versions, restore the group back.

This partially reverts commit 791d84d066573d3c2f334ebe7043c59a83eb1d5a.

allotria/intellij-community,allotria/intellij-community,allotria/intellij-community,allotria/intellij-community,allotria/intellij-community,allotria/intellij-community,allotria/intellij-community,allotria/intellij-community,allotria/intellij-community,allotria/intellij-community,allotria/intellij-community,allotria/intellij-community,allotria/intellij-community