Introduce devfile operations module

Issue: Backend: Add devfile_operations module to handl... (#545662 - closed)

What does this MR do and why?

Introduce devfile operations module

This module will be used to perform devfile validation operations. When creating a workspace, we will call the files from this module.

The changes done in this MR are as follows

• Move ee/lib/remote_development/workspace_operations/create/devfile_flattener.rb to ee/lib/remote_development/devfile_operations/flattener.rb.
• Move ee/lib/remote_development/workspace_operations/create/devfile_validator.rb to ee/lib/remote_development/devfile_operations/validator.rb.
• Move parse_devfile_yaml logic from ee/lib/remote_development/workspace_operations/create/devfile_fetcher.rb to ee/lib/remote_development/devfile_operations/yaml_parser.rb.
• Introduce ee/lib/remote_development/devfile_operations/main.rb which will be used by the GraphQL endpoint to validate devfile YAMLs.
• Remove ee/lib/remote_development/workspace_operations/create/devfile_validator.rb and call the devfile validation processing directly.

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