Move joint transmitted wrench test to separate file

[nkoenig]

🎉 New feature (sort of)

This moves the JointTransmittedWrenchFeaturesTest to a separate file. Nothing else was changed. This is a cleanup of #434.

Checklist

• Signed all commits for DCO
• Added tests
• Added example and/or tutorial
• Updated documentation (as needed)
• Updated migration guide (as needed)
• Consider updating Python bindings (if the library has them)
• codecheck passed (See contributing)
• All tests passed (See test coverage)
• While waiting for a review on your PR, please help review another open pull request to support the maintainers

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.

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➡️ Forward port

Port <FROM_BRANCH> to <TO_BRANCH>

Branch comparison: https://github.com/gazebosim//compare/<TO_BRANCH>...<FROM_BRANCH>

Note to maintainers: Remember to Merge with commit (not squash-merge or rebase)

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🎈 Release

Preparation for <X.Y.Z> release.

Comparison to <x.y.z>: https://github.com/gazebosim//compare/<LATEST_TAG_BRANCH>...<RELEASE_BRANCH>

Needed by <PR(s)>

Checklist

• Asked team if this is a good time for a release
• There are no changes to be ported from the previous major version
• No PRs targeted at this major version are close to getting in
• Bumped minor for new features, patch for bug fixes
• Updated changelog
• Updated migration guide (as needed)
• Link to PR updating dependency versions in appropriate repository in gazebo-release (as needed):

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

Merging #495 (f4267c0) into gz-physics6 (930a223) will decrease coverage by 0.55%.
The diff coverage is n/a.

❗ Current head f4267c0 differs from pull request most recent head c0c1c9c. Consider uploading reports for the commit c0c1c9c to get more accurate results

@@               Coverage Diff               @@
##           gz-physics6     #495      +/-   ##
===============================================
- Coverage        75.56%   75.02%   -0.55%     
===============================================
  Files              142      142              
  Lines             7191     7191              
===============================================
- Hits              5434     5395      -39     
- Misses            1757     1796      +39     

see 3 files with indirect coverage changes

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[scpeters]

looks good. test failure on macOS is pre-existing:

https://build.osrfoundation.org/view/ign-garden/job/ignition_physics-ci-gz-physics6-homebrew-amd64/54/testReport/(root)/COMMON_TEST_simulation_features_bullet-featherstone/test_ran/history/