Added test for open-loop odometry with clamped input (backport #2280)

[mergify]

Closes #2279

Description

This PR adds the missing test coverage 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.

  ---

  This is an automatic backport of pull request Added test for open-loop odometry with clamped input #2280 done by Mergify.

[mergify]

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Unmerged paths:
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	both modified:   diff_drive_controller/test/test_diff_drive_controller.cpp

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.52%. Comparing base (9e7dc55) to head (d401886).
⚠️ Report is 1 commits behind head on jazzy.

Additional details and impacted files

@@            Coverage Diff             @@
##            jazzy    #2284      +/-   ##
==========================================
+ Coverage   84.36%   84.52%   +0.16%     
==========================================
  Files         153      153              
  Lines       15162    15210      +48     
  Branches     1348     1348              
==========================================
+ Hits        12791    12856      +65     
+ Misses       1883     1868      -15     
+ Partials      488      486       -2     

Flag	Coverage Δ
unittests	84.52% <100.00%> (+0.16%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...ive_controller/test/test_diff_drive_controller.cpp	94.92% <100.00%> (+0.70%)	⬆️

... and 2 files with indirect coverage changes

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