[SIGMON-149] Analyse notebook content in the tests

Context

• task: https://its.cern.ch/jira/browse/SIGMON-149
• lhc-sm-hwc MR: lhc-sm-hwc!34 (merged)

What was done

• outputs.py module created

TODO

• document everything

QA

• no sonar
• code was unit tested
• acceptance tests were written

Review objectives

• assessment of code functionality
• assessment of code quality
• identifying potential refactorings / logic common to other projects
• knowledge sharing