Since generated sdf files are now marked as <model>-gen.sdf, `iris.sdf` should be also marked as `iris-gen.sdf`
Move iris to jinja templates

This commit deprecates the xacro based sdf generation for the iris model

This commit moves the meshfiles out of rotors_description so that we can deprecate rotors_description once the mutlivehicle scripts are based on jinja templates

Wasn't able to build mavsdk  tests due to the incorrect mavsdk version

- Explicitly state that the sdf file is genretaed
- Remove -0
- Remove redundant channels
- Fix model configs