Let derived sensors call Sensor::Update

[chapulina]

🦟 Bug fix

• Related to Cleanup update call for non-rendering sensors gz-sim#1282

Summary

Ignition Gazebo calls update directly on non-rendering sensors, but it's easy to call the "wrong" function if one is not careful. There are 2 Update functions on the base class:

1. public: bool Update(const std::chrono::steady_clock::duration &_now, const bool _force);
2. public: virtual bool Update(const std::chrono::steady_clock::duration &_now) = 0;

Most (all?) of the time, one would want to call 1., which calls 2. under the hood and performs extra steps. But since 2. is also public, and easier to call, we often call 2. directly by mistake.

This PR solves one of the issues by making it easier to call the base class's function. The test changes in this PR wouldn't be possible without the using lines, for example. Also see the ign-gazebo PR:

• Improve Sensor::Update call gz-sim#1283

We should consider also making the virtual function private, which will require a tick-tock cycle.

Checklist

• Signed all commits for DCO
• Added tests
• Updated documentation (as needed)
• Updated migration guide (as needed)
• codecheck passed (See contributing)
• All tests passed (See test coverage)
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[codecov]

Codecov Report

Merging #187 (971c1e0) into main (53bcc7f) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #187   +/-   ##
=======================================
  Coverage   70.31%   70.31%           
=======================================
  Files          28       28           
  Lines        2975     2975           
=======================================
  Hits         2092     2092           
  Misses        883      883           

Impacted Files	Coverage Δ
include/ignition/sensors/ForceTorqueSensor.hh	100.00% <ø> (ø)

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[chapulina]

The warning on Jenkins is not introduced by this PR and should be solved when #188 is merged forward.