Filter deployments using the environment & status

What does this MR do?

This adds support to DeploymentsFinder and the deployments API for filtering deployments using an environment name and/or deployment status. This for example allows one to get all successful deployments for the "production" environment, without having to filter out deployments manually.

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