Add INSTALL_TARGET argument to rapids_add_test()

[KyleFromNVIDIA]

Description

If another command, such as mpiexec, is used to execute a target, rapids_add_test() currently has no way of installing the target dependency. Add an INSTALL_TARGET argument to support this use case.

Checklist

• I am familiar with the Contributing Guidelines.
• New or existing tests cover these changes.
• The documentation is up to date with these changes.
• The cmake-format.json is up to date with these changes.
• I have added new files under rapids-cmake/
  • I have added include guards (include_guard(GLOBAL))
  • I have added the associated docs/ rst file and update the api.rst

[KyleFromNVIDIA]

Currently testing this PR over at rapidsai/cugraph#4656

[bdice]

I think I understand this. But it's right at the edge of my knowledge of targets/install commands. Feel free to seek a second reviewer if you think it'd be worthwhile.

[vyasr]

Works for me. I don't think there's a general solution for inferring the target so making it explicit is good.

[KyleFromNVIDIA]

/merge