There is no need in Python on linux anymore to obtain environment variables
Python script changed to direct `env -0` call on linux
printenv binary for macOS and its source code updated to write output directly to stdout, not to temporary file
Added tests with testcontainers to detect problems on different linux distros
(cherry picked from commit 72f7f7ad782cdb4632980d2622023d117e4485dc)
IJ-CR-19090
GitOrigin-RevId: 95b4cc5cca0cff27856a4e92d4ed26fd8aead416