By Joanna Plucinska, Susanne Neumayer-Remter and Christine Uyanik LONDON/MUNICH (Reuters) – Travel within Europe in the busy holiday season is exceeding 2022 levels, despite security warnings from authorities around Europe as consumers remain determined to enjoy holidays, prolonging the post-pandemic travel boom. Christmas markets and popular tourist sites in cities such as Munich and Paris have been bustling lately, albeit with strong security presences, as holiday travel within the European Union and including Britain was set to climb 22% above 2022 levels, according to travel data firm Forw…