[Windows] Only use long executable path when necessary, fix broken apksigner detection. #96777
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Fixes #96762
Seems like Windows does not support
\\?\
prefixed long paths when running batch files (works fine with executables), so use for OS execute methods only if path is longer than 260 characters.Fixes #95070
apksigner
can't run without validJAVA_HOME
set, and it was updated only after it is called.