[3.14] gh-145417: Do not preserve SELinux context when copying venv scripts (GH-145454) (#145549)

gh-145417: Do not preserve SELinux context when copying venv scripts (GH-145454)
(cherry picked from commit dbe0007ab2ff679c85d88e62fb875437b2dc2522)

Co-authored-by: Shrey Naithani <shrey.naithani@shelllite.tech>
Co-authored-by: Miro Hrončok <miro@hroncok.cz>
Co-authored-by: blurb-it[bot] <43283697+blurb-it[bot]@users.noreply.github.com>
Co-authored-by: Victor Stinner <vstinner@python.org>