Rake task to generate raw SQLs for usage ping

What does this MR do?

Add a rake task to generate raw SQLs for usage ping

The idea is to empower data, telemetry, product and other teams to get the raw SQLs for each and all usage metrics.

Usage areas could be:

• To create charts for SaaS (gitlab.com) my modifying the queries

How to use it?

On your local GDK installation run the following for the YAML and JSON versions respectively

bin/rake gitlab:usage_data:dump_sql_in_yaml


# for JSON version
bin/rake gitlab:usage_data:dump_sql_in_json


# or to dump into
bin/rake gitlab:usage_data:dump_sql_in_yaml > ~/Desktop/usage-metrics-2020-09-02.yaml

Related #244298 (closed)

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content

Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• Tested in all supported browsers
• Informed Infrastructure department of a default or new setting change, if applicable per definition of done

Security

If this MR contains changes to processing or storing of credentials or tokens, authorization and authentication methods and other items described in the security review guidelines:

• Label as security and @ mention @gitlab-com/gl-security/appsec
• The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
• Security reports checked/validated by a reviewer from the AppSec team