Move Seed logic for Deployment and Environment to Service class

What does this MR do and why?

This MR moves logic of creating Environments/Deployments to service classes from seed classes. This allows us to use the same service in the other places, such as Job retry and play.

• Logic in Pipeline::Seed::Deployment is moved to Deployments::CreateForBuildService
• Logic in Pipeline::Seed::Environment and Pipeline::Chain::EnsureEnvironments is moved to Environments::CreateForBuildService

Notes:

• No business logic is changed.
• Preparation for !103196 (closed)
• Closes Move `Gitlab::Ci::Pipeline::Seed::Deployment/En... (#348778 - closed)

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