Found a YouTube video showing how to do it a while back but CDPR patched the way through described in the video so that method doesn't work any more. There are however several other ways to get to the other side of the wall without using mods or cheats if one is persistent by exploring thoroughly or being creative with cyberware. One problem people face is that the split second someone posts a video or something showing how to glitch through the wall or something similar, CDPR is likely to patch that in the next game patch too and one area of having fun is cut off unless one uses mods, so nobody wants to share the info. My recommendation is to either be very persistent at looking for ways to the other side of the wall, be it over it, under it, around it or straight through it. Where there is a will there is a way... but where there is no will, there are mods.
Kind of fun to search for game glitches though too, rewarding when you find one.
There are some really interesting weird areas out beyond the wall all around the border of the map, all of which can be reached. The only place in the game my buddy and I have not been able to get to so far that we know is there, is the Casino north east of North Oak. We can see it decently from the top of the tower in North Oak (a brutal 4 hour long climb that was...). Sadly while it was a lot of fun to explore in the great wilderness beyond the game's imposed artificial fence, there isn't really much out there to see either except a lot of glitched terrain, bigger part of the oil fields, the other side of the chasm where the crane is, a round island that looks like a color palette wheel or something the devs were testing textures on, and a partially constructed building that is floating in the air beyond reach West of biotechnica flats. Found something else that was interesting and we weren't sure what it was, but I believe it might be related to one of the end game questlines so don't want to spoiler it if that's the case (I haven't seen all the endings yet so not entirely sure).
Sorry to not be more specific, but it kinda sucks that if we share certain things they'll probably fix them in a future patch. Good luck on the search, only took us a few hours to find a way, then another, then another... all with patch 1.23.