test(autoware_universe_utils): make opencv_fast_atan2 test reproducible

[mojomex]

Description

PR #9710 made the random numbers used in the trigonometry_opencv_fast_atan2 test random, but introduced made the test non-reproducible.
The common wisdom is to initialize all random number generators used in unit tests with a fixed seed, so the same numbers are generated across test runs.

This PR does that for the abovementioned test.

Related links

• fix(autoware_universe_utils): fix bug in test #9710

How was this PR tested?

Printing x/y similar to #9710. Note how before this PR, the values change across runs, whereas with this PR they stay constant (reproducible).

Before:

# Run 1
x=-7.54321    y=1.59532
x=-1.60106    y=-9.32045
x=2.97877     y=-3.35861
# Run 2
x=-1.19224    y=8.64908
x=-0.808514   y=-0.856808
x=5.27276     y=5.93498

After:

# Run 1
x=6.29447     y=-7.29046
x=8.11584     y=6.70017
x=-7.46026    y=9.37736
# Run 2
x=6.29447     y=-7.29046
x=8.11584     y=6.70017
x=-7.46026    y=9.37736

Effects on system behavior

None.

[github-actions]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 28.37%. Comparing base (b3c69b4) to head (b17d7ee).
Report is 7 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9728      +/-   ##
==========================================
+ Coverage   28.33%   28.37%   +0.03%     
==========================================
  Files        1485     1485              
  Lines      111092   111091       -1     
  Branches    43152    43151       -1     
==========================================
+ Hits        31483    31520      +37     
+ Misses      76588    76544      -44     
- Partials     3021     3027       +6     

Flag	Coverage Δ		*Carryforward flag
differential	31.17% <ø> (?)
total	28.30% <ø> (-0.04%)	⬇️	Carriedforward from b3c69b4

*This pull request uses carry forward flags. Click here to find out more.

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[xmfcx]

@soblin @takayuki5168 @TakaHoribe @veqcc can you review?

[veqcc]

Thank you for correcting my mistake 👍
It needs approvals from code owners