Reduce output from run() (info -> debug)

Motivation:

- the actual command we run is pretty meaningless without context.
- to provide the context, we would need to add additional 'logging.info' command
  BEFORE we call `run`
- if we select loglevel `debug` we get to see the same output as before.

mpsd-software-environment.py

@@ -324,7 +324,7 @@ def run(*args, counter=[0], **kwargs):
     options = ", ".join([f"{key}={value}" for key, value in kwargs.items()])
 
     # provide information about upcoming subprocess.run call
-    logging.info(f"{token} Starting subprocess.run('{command}') with options {options}")
+    logging.debug(f"{token} Starting subprocess.run('{command}') with options {options}")
     logging.debug(f"{token}   getcwd={os.getcwd()}")
     logging.debug(f"{token}   exact call: subprocess.run({arg})")