Implement error_tracking API

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There is currently no support for managing the Sentry integration via the error_tracking API https://docs.gitlab.com/ee/api/error_tracking.html. Seems pretty easy to add, though.

Implementation Guide

• Read the CONTRIBUTING.md guide to set up your local development environment and clone the community fork on this project.
• Update the ruby startup script to use the built-in sentry instead of requiring an external sentry, which will be required for testing the terraform resource
• Create the terraform resource itself + tests following the docs/development/CreatingANewResource.md guide.