Added test for open-loop odometry with clamped input

[Devdoot57]

Description

This PR adds the missing test coverage requested in #2279 to verify the open-loop odometry fix.

Implementation Details:

• Initializes the DiffDriveController with open_loop set to true and strict velocity limits configured for both linear.x and angular.z.
• Deliberately publishes a Twist command that exceeds the configured limits.
• Executes the update() loop and asserts that both the instantaneous velocities (getLinear(), getAngular()) and the integrated positions (getX(), getHeading()) are calculated using the successfully clamped values, not the raw commands.

[christophfroehlich]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.72%. Comparing base (fafccb5) to head (26cf420).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2280      +/-   ##
==========================================
+ Coverage   84.68%   84.72%   +0.03%     
==========================================
  Files         153      153              
  Lines       15318    15341      +23     
  Branches     1332     1332              
==========================================
+ Hits        12972    12997      +25     
+ Misses       1858     1857       -1     
+ Partials      488      487       -1     

Flag	Coverage Δ
unittests	84.72% <100.00%> (+0.03%)	⬆️

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Files with missing lines	Coverage Δ
...ive_controller/test/test_diff_drive_controller.cpp	94.88% <100.00%> (+0.31%)	⬆️

... and 1 file with indirect coverage changes

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