Simon Rattle was getting ready to leave Europe for the first time since the start of the pandemic and head to California with the London Symphony Orchestra for a residency with students at Santa Barbara’s Music Academy of the West.“It’s kind of a miracle that it’s happening,” he said.A U.S. tour started Saturday in Palo Alto, continued on to Berkeley and Costa Mesa before three concerts in Santa Barbara this week.The symphony launched its partnership with the academy in 2018 when five section principals spent 10 days teaching and picked a dozen students as fellows to work with the orchestra in London the following January.