Exclude depthai-examples from depthai-ros metapackage

Currently, the `depthai-examples` package attempts to download remote files in its `CMakeLists.txt`: https://github.com/luxonis/depthai-ros/blob/jazzy/depthai_examples/CMakeLists.txt#L26-L46 Because the `depthai-ros` metapackage includes `depthai-examples`, this prevents the use it entirely.