Spike: Identify gaps in devfile schema support
## Goal
Identify the elements of the devfile schema that we don't currently support and determine the use case, value, and whether support is required for GA.
## Details
- **Devfile spec:** What part of the devfile spec
- **Summary:** Details about what this part of the spec is used for
- **Use case:** How that would be used in GitLab
- **Required?:** Whether we _ever_ can or need to to support this?
- **GA?:** Whether this is needed for GA
| Devfile spec | Summary | Use case | Required? | GA? |
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