chore(imu_monitor): change yaw_rate_diff_threshold from 0.14 to 0.18

[TomohitoAndo]

Description

Tuned yaw_rate_diff_threshold based on experimental data.
I modified this value in this PR before, but the threshold was not enough.

Related ticket
TIER IV INTERNAL LINK

Tests performed

Tested on an actual vehicle.

Effects on system behavior

Not applicable.

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[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (beta/v0.6.1@f93e66a). Click here to learn what that means.
Patch has no changes to coverable lines.

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Additional details and impacted files

@@              Coverage Diff               @@
##             beta/v0.6.1     #582   +/-   ##
==============================================
  Coverage               ?   10.58%           
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  Files                  ?     1249           
  Lines                  ?    90052           
  Branches               ?    20801           
==============================================
  Hits                   ?     9532           
  Misses                 ?    70433           
  Partials               ?    10087           

Flag	Coverage Δ		*Carryforward flag
differential	0.00% <0.00%> (?)
total	10.56% <0.00%> (?)		Carriedforward from b7d18ed

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

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