Remove clock from RobotTrajectory

[tylerjw]

Description

Clock is never set or used by any of the methods.

[codecov]

Codecov Report

Base: 51.07% // Head: 51.11% // Increases project coverage by +0.05% 🎉

Coverage data is based on head (020a145) compared to base (97c7dbb).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1639      +/-   ##
==========================================
+ Coverage   51.07%   51.11%   +0.05%     
==========================================
  Files         381      381              
  Lines       31742    31742              
==========================================
+ Hits        16209    16222      +13     
+ Misses      15533    15520      -13     

Impacted Files	Coverage Δ
...include/moveit/robot_trajectory/robot_trajectory.h	98.72% <ø> (ø)
moveit_ros/moveit_servo/src/pose_tracking.cpp	77.26% <0.00%> (+0.48%)	⬆️
...dl_kinematics_plugin/src/kdl_kinematics_plugin.cpp	77.15% <0.00%> (+1.08%)	⬆️
moveit_ros/moveit_servo/src/servo_calcs.cpp	67.95% <0.00%> (+1.50%)	⬆️

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