Usage Ping for Grafana Integration Part 1

What does this MR do?

This merge requests adds 1 count to the usage ping:

• Count projects where the Grafana integration is enabled

A user can only add one GrafanaIntegration per project.

This integration is added via the ui in settings>operations when the :gfm_grafana_integration feature flag is on.

In a separate MR I will add:

• [-] Count total issues in an instance where a Grafana chart has been embedded

Screenshots

No front end changes

Does this MR meet the acceptance criteria?

Conformity

• [-] Changelog entry
• [-] Documentation created/updated or follow-up review issue created
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• [-] Separation of EE specific content

Availability and Testing

Specs added to usage_data_spec.rb.

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• [-] Tested in all supported browsers

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

#31385 (closed)