tests: ensure `$PYTHON` is quoted for Windows
Global installs of python3 go into "Program Files", and tons of tests fail with
mysterious errors if this isn't quoted. Most of this is a followup to
0826d684a1b5, but a some of these were existing issues. Shebang lines are
ignored because quoting breaks direct execution- these will need to be launched
indirectly with the quoted `$PYTHON` command.
Differential Revision: https://phab.mercurial-scm.org/D10633
cat >> $HGRCPATH <<EOF
[extensions]
narrow=
[ui]
ssh="$PYTHON" "$RUNTESTDIR/dummyssh"
[experimental]
changegroup3 = True
EOF