Fix off-by-one error with sourcemaps #24982
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We had a discrepancy in our source map encoding and decoding logic, where we encoded source maps using 1-based line/column offsets, but decoded source maps using 0-based line/column offsets. This off-by-one error became apparent when we switched away from index maps into a merged source map for project reference builds. This PR switches all source map encoding and decoding to 0-based line/column offsets to align both and simplify the math involved.