Update "reset-data-and-import-content" blueprint to also include importing content and error_log messages

[juanmaguitar]

This PR updates reset-data-and-import-content blueprint example to:

• Also import custom content after resetting default content
• Log at debug.log the state of the content after every step

These additions will make this example a good reference for showing how can add debug messages to our playground blueprints and check those messages from https://playground.wordpress.net/

https://playground.wordpress.net/?blueprint-url=https://raw.githubusercontent.com/wordpress-juanmaguitar/blueprints/trunk/blueprints/reset-data-and-import-content/blueprint.json

[github-actions[bot]]

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[adamziel]

Thank you @juanmaguitar!