TUN-10390: Call prechecks

Final run method, which runs cloudlflared pre-checks for both the normal startup procedure, as well as cloudflared diag.

For cloudflared diag, this produces a new json output to which is added to the final zip file.

Also added in a new flag to prevent this from running all the time, at least for now until we are 100% sure this works as intended. We will later remove this flag, only leaving in `--no-prechecks`, so this runs by default for everyone using cloudflared.

Tested pre-checks locally with origintunneld. The results show all pre-checks succeeding. In this case, it ran with only 1 region, since locally we run it with `--edge origintunneld1:7844`.

![Screenshot 2026-05-07 at 13.19.19.png](/uploads/8d0031d7c819d8a761707fe9d845667f/Screenshot_2026-05-07_at_13.19.19.png){width=900 height=217}