fix: use saturating_add on received_movement_packets

[TestingPlant]

Without saturating_add, the server may panic if it receives too many movement packets within one tick.

[github-actions]

Benchmark Results for general

ray_intersection/aabb_size_0.1                     [  33.6 ns ...  33.5 ns ]      -0.30%
ray_intersection/aabb_size_1                       [  33.6 ns ...  33.5 ns ]      -0.33%
ray_intersection/aabb_size_10                      [  24.6 ns ...  24.6 ns ]      -0.09%
ray_intersection/ray_distance_1                    [  13.4 ns ...  13.4 ns ]      -0.14%
ray_intersection/ray_distance_5                    [  13.5 ns ...  13.6 ns ]      +0.04%
ray_intersection/ray_distance_20                   [  13.5 ns ...  13.5 ns ]      +0.02%
overlap/no_overlap                                 [  24.5 ns ...  24.4 ns ]      -0.10%
overlap/partial_overlap                            [  24.6 ns ...  24.6 ns ]      -0.02%
overlap/full_containment                           [  22.5 ns ...  22.5 ns ]      -0.09%
point_containment/inside                           [   4.9 ns ...   4.9 ns ]      +0.41%
point_containment/outside                          [   4.4 ns ...   4.4 ns ]      +0.15%
point_containment/boundary                         [   4.9 ns ...   4.9 ns ]      -0.43%

Comparing to e31bb7c

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 20.85%. Comparing base (e31bb7c) to head (12214ae).

Files with missing lines	Patch %	Lines
crates/hyperion/src/simulation/handlers.rs	0.00%	1 Missing ⚠️

@@           Coverage Diff           @@
##             main     #894   +/-   ##
=======================================
  Coverage   20.85%   20.85%           
=======================================
  Files         161      161           
  Lines       16867    16867           
  Branches      468      468           
=======================================
  Hits         3518     3518           
  Misses      13285    13285           
  Partials       64       64           

Files with missing lines	Coverage Δ
crates/hyperion/src/simulation/handlers.rs	4.20% <0.00%> (ø)

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