Chain zombie dogs via copy-from

[Karol1223]

Summary

None

Purpose of change

I wanted to get that out of the way before I add scorched dogs in #75071. Also to make the doggies less overlook-prone, and less intimidating. There's still some weirdness around there, but I tried to minimize the amount of actual gameplay changes this PR would bring.

Describe the solution

For the most part, just chains the dogs via copy-from, and removes some useless lines where copy-from was already present

The gameplay changes I opted to include due to being caused by flags or other similar weirdness are as follows:

• All dogs got GROUP_BASH, to go in line with regular zombies
• Z-9's and Rottweilers lost PUSH_MON because... they're still dogs. Barghests and Hulking Horrors still keep the flag
• Removed the cuspated dog's tracked scents, as it didn't have SMELLS flag and the description leads me to believe it's not supposed to have a functional nose
• Added lots of missing flags to the skeletal doggies, like WARM, BASHES, or STUMBLES. Did NOT give them SMELLS
• Lowered the half-life for Z-9's to upgrade from 30 to 28 days
• Removed the cuspated dog's field for grabs of 0, instead just took away the GRABS flag entirely

Describe alternatives you've considered

Including the Grim Howlers? But they're technically wolves, not dogs, so I left them out for now at least.

Testing

Additional context