Cleanup old internal API (backport #2346)

[mergify]

This PR cleans up old internal API that is unused after #2323 :)

---

This is an automatic backport of pull request #2346 done by Mergify.

[mergify]

Cherry-pick of cd7e522 has failed:

On branch mergify/bp/jazzy/pr-2346
Your branch is up to date with 'origin/jazzy'.

You are currently cherry-picking commit cd7e522.
  (fix conflicts and run "git cherry-pick --continue")
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Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   controller_manager/src/controller_manager.cpp
	both modified:   hardware_interface/src/resource_manager.cpp

no changes added to commit (use "git add" and/or "git commit -a")

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.63%. Comparing base (9c9d361) to head (09e2b0b).
Report is 1 commits behind head on jazzy.

Additional details and impacted files

@@            Coverage Diff             @@
##            jazzy    #2358      +/-   ##
==========================================
+ Coverage   88.60%   88.63%   +0.02%     
==========================================
  Files         148      148              
  Lines       16918    16918              
  Branches     1446     1446              
==========================================
+ Hits        14991    14995       +4     
+ Misses       1371     1367       -4     
  Partials      556      556              

Flag	Coverage Δ
unittests	88.63% <ø> (+0.02%)	⬆️

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Files with missing lines	Coverage Δ
hardware_interface/src/resource_manager.cpp	74.71% <ø> (ø)

... and 2 files with indirect coverage changes

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