Add missing link of mock_components to hardware_interface (backport #1992)

[mergify]

mock_components uses symbols defined in hardware_interface, but is not linking it. This is fine on ELF platforms where linker typically do not report errors is a symbols is undefined in a library, and the only important thing is that the symbols is eventually defined in the final linked executables, but on different platforms (like macOS or Windows) this missing link can create link errors.

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This is an automatic backport of pull request #1992 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of d501f1b has failed:

On branch mergify/bp/humble/pr-1992
Your branch is up to date with 'origin/humble'.

You are currently cherry-picking commit d501f1b.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   hardware_interface/CMakeLists.txt

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

[christophfroehlich]

Already included on humble.