Garden: fix physics, rendering, transport rpath issues and add tests

[scpeters]

This adds custom CMAKE_INSTALL_RPATH entries for
formulae with binaries installed to nested subfolders, such as /libexec/gz/transport12 and
/lib/gz-physics-6/engine-plugins.
This should fix library loading issues with ARM CPUs. This adds tests as well.

• gz-rendering: patch for ogre2 rpath

This is a follow-up to #2404.

I'm having trouble with gz-gui, but have fixed the other packages.

[scpeters]

build bottle

[scpeters]

build bottle

[scpeters]

build bottle

[iche033]

what's the proper way to install and test this? I installed by doing brew install --build-from-source ./gz-<lib_name>.rb and then was able to launch gz sim -v 4 -s shapes.sdf but when launching the gui, the gui plugins (in both gz-sim and gz-gui) complain about rpath issues.

[scpeters]

what's the proper way to install and test this? I installed by doing brew install --build-from-source ./gz-<lib_name>.rb and then was able to launch gz sim -v 4 -s shapes.sdf but when launching the gui, the gui plugins (in both gz-sim and gz-gui) complain about rpath issues.

I can't figure out how to fix the rpath issues for the gz-gui plugins, and I forgot one of the gz-sim gui plugin folders, so this PR is just about getting the gz-sim server running.

[iche033]

I can't figure out how to fix the rpath issues for the gz-gui plugins, and I forgot one of the gz-sim gui plugin folders, so this PR is just about getting the gz-sim server running.

ok got it. gz sim -s works for me.

[scpeters]

I've tracked down the issues with the gui plugins, and it will require further changes to gz-sim7, so I've redacted those changes from this pull request and will update it in a follow-up