Replace all usages of /bin/bash shebang with /usr/bin/env (#40756)

Replace all usages of /bin/bash shebang with /usr/bin/env (#40756)

Replace all usages of /bin/bash with /usr/bin/env

/usr/bin/env is nearly guaranteed to always exist at that location, which can't be said about /bin/bash and /bin/sh.

Co-authored-by: opl <4833621+opl@users.noreply.github.com>