[v8] Enable tests

[traversaro]

Given what we learned in conda-forge/gz-sensors-feedstock#51, we can now enable tests also here, these may be helpful to early catch errors like robotology/gz-sim-yarp-plugins#208 .

Checklist

• Used a personal fork of the feedstock to propose changes
• Bumped the build number (if the version is unchanged)
• Reset the build number to 0 (if the version changed)
• Re-rendered with the latest conda-smithy (Use the phrase @conda-forge-admin, please rerender in a comment in this PR for automated rerendering)
• Ensured the license file is being packaged.

[conda-forge-admin]

Hi! This is the friendly automated conda-forge-linting service.

I just wanted to let you know that I linted all conda-recipes in your PR (recipe/meta.yaml) and found it was in an excellent condition.

[traversaro]

@conda-forge-admin please rerender

[traversaro]

metal tests are failing also here in v8, even if in robotology/gz-sim-yarp-plugins#208 with gz-rendering8 the macos/metal tests were passing (the same test that fail for gz-rendering9).

[traversaro]

Let's close, I just wanted to see if metal test passed on v8, if we are able to get #35 to work we can then backport the fixes here.