Remove deprecated devfile_ref from GraphQL

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MR: Pending

Description

We would need to remove the deprecated devfile_ref field from GraphQL workspace_type and mutation WorkspaceOperations::Create. Pls see the MR here for reference.

The field was deprecated in GitLab release %17.8 as part of Use default devfile with golden image to create... (!171230 - merged). Based on the deprecation process, https://gitlab.com/gitlab-org/gitlab/-/blob/master/doc/api/graphql/index.md#deprecation-and-removal-process. The earliest removal release would be %19.0.

Acceptance Criteria

• Remove deprecated devfile_ref field from GraphQL workspace_type
• Remove API doc references for this field