WIP: test[cartesian]: Treat warnigns as errors

[romanc]

Description

In our on-going efforts to productize ndsl, treat warnings as errors in cartesian tests.

This was triggered by PR #1709, where the deprecation warning was only seen by chance and we weren't aware of changes in DaCe.

Two sources of warnings stand out from local testing

• Fixed: license file wasn't configured correctly, which issued a warning in almost any test
• To be discussed: deprecation of __INLINED keyword in gt4py, see issues Add deprecation warning for use of __INLINED #1068 and Deprecate use of __INLINED #1012 for context and an initial discussion.

Requirements

• All fixes and/or new features come with corresponding tests.
• Important design decisions have been documented in the approriate ADR inside the docs/development/ADRs/ folder.

If this PR contains code authored by new contributors please make sure:

• The PR contains an updated version of the AUTHORS.md file adding the names of all the new contributors.

[romanc]

Discussions around __INLINED will continue in GEOS-ESM/NDSL#67. License file will be fixed in PR #1718.

Closing as no-op for now since we don't have the bandwidth to deal with the __INLINED keyword properly.