all: fix patch testing for bugs witout C repro

Syzbot tests patches with -collide=true in order to trigger more bugs,
but now that -collide flag is deprecated, this no longer makes sense.
Moreover, it actually prevents the testing of bugs with syz repro now -
syz-execprog immediately exits due to -collide=true and env.Test()
accepts it as a normal outcome.

Set -collide=true only for those bugs, where collide was set to true by
the reproducer (and therefore syzkaller at that revision supported it).

Don't exit from syz-execprog immediately if -collide is set to true.
This will prevent such bugs from happening later and make the problem
more visible.

This was initially part of #3083, but seems to be more urgent to merge,
so pushing it as a separate PR.

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