Enable usage_billing_dev feature flag

Suraj Tripathirequested to merge
enable_usage_billing_dev_for_sm into master

What does this MR do and why?

Enable usage_billing_dev feature flag

This feature flag is used to hide/show the GitLab Credits Dashboard. This dashboard consumes the CustomersDot API to show users AI billing events and their corresponding credit usage

Changelog: changed EE: true

References

https://gitlab.com/gitlab-org/gitlab/-/issues/566581+

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Before After

How to set up and validate locally

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