Update sensors with pending trigger immediately in Sensors system

[shameekganguly]

🦟 Bug fix

Fixes gazebosim/gz-sensors#426

Summary

Update Sensors system to ignore update rate for sensors that have pending triggers and update them immediately. Depends on upstream gazebosim/gz-sensors#431.

Note to maintainers: Remember to use Squash-Merge and edit the commit message to match the pull request summary while retaining Signed-off-by messages.

[codecov]

Codecov Report

Attention: Patch coverage is 85.71429% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 65.92%. Comparing base (922eea7) to head (d8d351d).
Report is 168 commits behind head on gz-sim8.

Files	Patch %	Lines
src/systems/sensors/Sensors.cc	85.71%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           gz-sim8    #2408      +/-   ##
===========================================
+ Coverage    64.88%   65.92%   +1.03%     
===========================================
  Files          360      327      -33     
  Lines        29448    31328    +1880     
===========================================
+ Hits         19108    20653    +1545     
- Misses       10340    10675     +335     

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