Update Distribution model

[Taniya-Das]

Change

Uses #465 to compare implemented model with conceptual model. Attached picture shows missing and extra fields in Distribution model. The model is also verified manually with the conceptual model json.

Only has_computational_requirement needs to be implemented. Rest of the fields already exist.
ComputationalRequirement has common fields with ComputationalAsset, which is being implemented in a separate PR #.
Will add those fields in ComputationalRequirement once they are created.

How to Test

Checklist

• Tests have been added or updated to reflect the changes, or their absence is explicitly explained.
• Documentation has been added or updated to reflect the changes, or their absence is explicitly explained.
• A self-review has been conducted checking:
  • No unintended changes have been committed.
  • The changes in isolation seem reasonable.
  • Anything that may be odd or unintuitive is provided with a GitHub comment explaining it (but consider if this should not be a code comment or in the documentation instead).
• All CI checks pass before pinging a reviewer, or provide an explanation if they do not.

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