[Simulation.Core] Remove useless and annoying timers

[alxbilger]

Useless:

For example, the timer in UpdateMappingVisitor::processMechanicalMapping does not measure anything.

Annoying:

I don't think it is a good practice to add timer on individual components. In particular, the ones I removed measure neglectable durations. The fact that there is one timer for every component adds a lot of pollution in the analysis of the timings, for nothing because it is neglectable.

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• it builds with SUCCESS for all platforms on the CI.
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• it does not generate new unit test failures.
• it does not generate new scene test failures.
• it does not break API compatibility.
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[alxbilger]

[ci-build][with-all-tests]

[alxbilger]

@epernod Thanks for the review. I added a description on the PR