You can buy outdoor direct bury cat 5e cable and it will likely work. You can if you choose use normal cable but bury plastic pipe to put it in. Depends if you think there is much possibility of it being cut.
Highly unlikely you will need a shielded cable. Cable tv will have no effect at all since that is a shielded cable. Power only matters if you are very close like less than a inch. Even then it seldom causes any issues. The thing that causes issues are stuff like ballast in florescent lights and then you have to almost wrap the wire around them to have them cause trouble.
Since you are not by code in just about any country allowed to run the data cable in the same conduit as power and power cable outside must be in a...