fix: display better error message for validate_ibm_catalog_json hook

[akocbek]

Description

when pre-commit hook validates ibm_catalog.json file, it checks the working_directory inside ibm_catalog.json file.

It can happen that 2 flavors have the same working_directory. If pre-commit hook fails, then the following error is thrown

If we look the error message, it seems as the same error is printed twice, which is not true (we have 2 flavors using the same value for working_directory. We should add more details to the error message, something like:

product_label: '[Add-ons Beta] RAG Pattern in Action: Application Sample'
flavor_label: 'Banking Application - Basic (Deploy on Code Engine)'
working_directory: 'solutions/bankings':

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[akocbek]

new error message print: