[Databricks E2E] Refactor code and log messages to stderr

[elenaterenzi]

Type of PR

• Code changes

Purpose

• Introduce a log function that makes sure that messages are always logged to stderr. From now on we should avoid using echo to send (human-readable) messages to console.
  • The function also takes care of changing the style of the displayed text using colors (using existing function print_style)
• code refactoring: changed some function names to keep the same naming convention
• commented a number of set -o xtrace that are printing tokens to console
• modified .Dockerfile to include a bicep upgrade to remove warnings

Does this introduce a breaking change? If yes, details on what can break

No breaking change, but moving forward we should use this new function to log messages to console

Author pre-publish checklist

• Added test to prove my fix is effective or new feature works
• No PII in logs
• Made corresponding changes to the documentation

Validation steps

• ...

Issues Closed or Referenced

• Closes code refactor: log function #929

[LiliamLeme]

Cool log function. I left just one comment while loading the env variables in the bash file., approving so it will not block you

[ydaponte]

I'm just think we should delete the trace instead of commenting not to have inactive code checked in - but maybe there is a reason why you want to keep it commented? Other than that - GREAT job! I'm thrilled that we have this function now!