oeqa/selftests/reproducible: use the jQuery CDN instead of jquery-native

oeqa/selftests/reproducible: use the jQuery CDN instead of jquery-native

Instead of building jquery-native and then copying the file into the
expected place in the build tree, simply tell diffoscope to load jQuery
from their CDN.

In the slim chance that the diffoscope report is viewed offline, the
only regression is that sections cannot be collapsed.

The advantage to this approach is that we no longer need to maintain a
jquery-native recipe simply for the reproducible selftests.

Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>