Gracefully handle failing to receive current user

[JCZuurmond]

In the installation we get the user currently logged in:

blueprint/src/databricks/labs/blueprint/installation.py

Line 423 in 5d8c69a

me = ws.current_user.me()

If the Databricks cli profile is misconfigured, this method might fail with JSON.DecodeError. This should be resolved by the user, but the error is non-informative. Instead we could catch this error, warn about a potential misconfigured profile, then re-raise the error again.

Note that a misconfigured profile might fail incosistently, thus it looks like a labs specific problem (or any other project that uses blueprint) while it is not, see this comment