fix(#3733): blank page when dRep have @value in uri or label references

[Ciabas]

List of changes

• Fix blank page on dRep details when link or identity references contain objects { @value: ... } not strings

Checklist

• related issue
• My changes generate no new warnings
• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the changelog
• I have added tests that prove my fix is effective or that my feature works

For own Verification

This sql can be used to extract the exact dRep data that was problematic for us and some other one with standard uri/label definitions.

SELECT
  dh.view AS drep_view,
  off_chain_vote_drep_data.given_name,
  jsonb_agg(
    jsonb_build_object(
    'uri',   COALESCE(
               CASE WHEN jsonb_typeof(ref->'uri') = 'string' THEN ref->>'uri' END,
               ref->'uri'->>'@value'
             ),
    '@type', ref->>'@type',
    'label', COALESCE(
               CASE WHEN jsonb_typeof(ref->'label') = 'string' THEN ref->>'label' END,
               ref->'label'->>'@value'
             )
  )
  ) AS link_references
FROM drep_hash dh
JOIN drep_registration dr ON dr.drep_hash_id = dh.id
JOIN voting_anchor va ON va.id = dr.voting_anchor_id
JOIN off_chain_vote_data ocvd ON ocvd.voting_anchor_id = va.id
JOIN off_chain_vote_drep_data ON off_chain_vote_drep_data.off_chain_vote_data_id = ocvd.id
CROSS JOIN LATERAL (
  SELECT ref
  FROM jsonb_array_elements(
    COALESCE((ocvd.json::jsonb)->'body'->'references', '[]'::jsonb)
  ) AS ref
  WHERE ref->>'@type' = 'Link'
) sub
WHERE dh.view = 'drep1jnmmkfwpta0yuwjchw0gu6csh75vy62088egy9n67d0zc7sn83m' OR dh.view = 'drep160v90f47eeqscq9aglzh8qxv8plskgxjtj9qgplgsz0kwskskjs'
GROUP BY dh.view, off_chain_vote_drep_data.given_name;

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@Ciabas
This PR is in the tag: develop-2d3a82c5091c81e23c871755c9ffba242958962d , for govtool-metadata-validation service

[github-actions]

@Ciabas
This PR is in the tag: develop-2d3a82c5091c81e23c871755c9ffba242958962d , for govtool-backend service

[github-actions]

@Ciabas
This PR is in the tag: develop-2d3a82c5091c81e23c871755c9ffba242958962d , for govtool-frontend service