perf(packages/codegen): remove `node` param from `write` and `markMap` functions in sourcemap builds (#25989)

Optimization to sourcemaps builds.

#25986 made the `node` param passed to `writeWithMap` etc redundant in sourcemap release builds.

Alter the TSDown plugin to remove the param from these functions in sourcemap release builds, and also remove the `node` argument from all call sites.

It was already removed in no-sourcemap builds - this only affects sourcemaps builds.