Print meson output in case of error during editable rebuild

[tobiasdiez]

In case there is an error during the call of meson build, it currently only prints

Traceback (most recent call last):
  File "/opt/conda/envs/sage-dev/lib/python3.11/site-packages/_sagemath_editable_loader.py", line 345, in _rebuild
    result = subprocess.run(
             ^^^^^^^^^^^^^^^
  File "/opt/conda/envs/sage-dev/lib/python3.11/subprocess.py", line 571, in run
    raise CalledProcessError(retcode, process.args,
subprocess.CalledProcessError: Command '['/opt/conda/envs/sage-dev/bin/ninja']' returned non-zero exit status 1.

in the console. This is not very helpful to diagonize the problem. With this PR, the full output of meson is printed.