By Sruthi Shankar and Bansari Mayur Kamdar (Reuters) -Britain’s FTSE 100 rose on Monday lifted by commodity stocks and an upbeat global mood, while shares of Haleon, spun off from drugmaker GSK, fell on their debut on the London Stock Exchange. The commodity-heavy FTSE 100 ended 0.9% up after rising as much as 1.5%. European markets trimmed some early gains after Russia’s Gazprom declared force majeure on gas supplies to Europe to at least one major customer. [.EU] “What we’re seeing is just the spillover effect from the Friday rebound,” said Michael Hewson, chief market analyst at CMC Markets…