Remove unused/already jsonized hardcoded monster attacks

[Karol1223]

Summary

None

Purpose of change

We had some old monster attacks that have already been jsonized but stuck around

Describe the solution

Delete some old monster attacks that have already been jsonized but stayed around in C++ for... reasons?
Replace the hardcoded versions of them with jsonified versions whenever in use
Affected the following

• stretch_bite
• tentacle
• impale
• longswipe

Describe alternatives you've considered

• smash - not possible to remove, the hardcoded version is still used as a part of another hardcoded special
• bio op takedown and impale - used as part of bio op biojutsu
• stretch attack - used in one melee test that I don't know how to edit them out of

Testing

Additional context

[github-actions]

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[Maleclypse]

This is a solid PR Karol! I know you do lots of work here but this one made me realize I hadn't thanked you recently. Thank you for all you do!