Remove unnecessary check in add_agent_pos!

[Tortar]

This will fail with an easy to bisect error anyway since adding to the model will fail since the agent type will not be accepted. Forgot to do it when merging #900

[Tortar]

wops! sorry renamed one of the files before merging without changing the including statement!!

[Tortar]

For some reason, I can't anymore bypass the protection rule otherwise I would have merged this one already

[codecov-commenter]

Codecov Report

Merging #903 (301d335) into main (fd62258) will increase coverage by 11.88%.
Report is 1 commits behind head on main.
The diff coverage is 88.50%.

@@             Coverage Diff             @@
##             main     #903       +/-   ##
===========================================
+ Coverage   80.21%   92.09%   +11.88%     
===========================================
  Files          44       33       -11     
  Lines        3028     2329      -699     
===========================================
- Hits         2429     2145      -284     
+ Misses        599      184      -415     

Files	Coverage Δ
src/Agents.jl	100.00% <ø> (ø)
src/core/higher_order_iteration.jl	83.33% <ø> (ø)
src/core/model_single_container.jl	90.00% <100.00%> (ø)
src/core/space_interaction_API.jl	93.18% <100.00%> (+0.10%)	⬆️
src/simulations/collect.jl	96.56% <100.00%> (+0.02%)	⬆️
src/simulations/sample.jl	100.00% <100.00%> (ø)
src/spaces/continuous.jl	92.34% <100.00%> (+0.04%)	⬆️
src/spaces/discrete.jl	98.87% <100.00%> (ø)
src/spaces/graph.jl	76.19% <100.00%> (ø)
src/spaces/grid_multi.jl	83.33% <100.00%> (ø)
... and 12 more

... and 12 files with indirect coverage changes

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[Datseris]

@Tortar I've updated the rules of Agents.jl to ensure high quality of contributions.

1. Can't push directly to master, must do PR.
2. PRs must have one accepting review from someone other than the creator.

Things might get slower, but they are safer this way.