Add dump_non_sql_in_json rake task

What does this MR do and why?

Describe in detail what your merge request does and why.

Add dump_non_sql_in_json rake task. This rake task will help engineers to debug and understand what values we add in the Service Ping payload for non-SQL data.

This payload is used to reconstruct Service Ping for GitLab.com in DWH.

More details about Service ping Automation.

Screenshots or screen recordings

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How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

# To add the data in a file
rake gitlab:usage_data:dump_non_sql_in_json > ../non_sql.json  

# Print the output
rake gitlab:usage_data:dump_non_sql_in_json

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.