By Sam Tobin LONDON (Reuters) – The British government’s decision to approve collapsed energy supplier Bulb’s acquisition by Octopus Energy faces a legal challenge from rival suppliers in early 2023, after a judge at London’s High Court refused to hear the case next week. British Gas, E.ON and Scottish Power are challenging the takeover of Bulb, which had around 1.5 million domestic customers and was one of the largest energy suppliers to collapse last year. The British government’s official budget forecaster said last month that support for Bulb will cost around 6.5 billion pounds ($7.8 billi…