test(population-density-data): add GEOHASHLIST support and rework time/error model - #128

[S-310] Schema of type integer must specify format (int32 or int64). | Suggestion: Add format: int32 or int64 to integer properties (CAMARA Design Guide section 2.2).

[S-312] Schema of type string must specify maxLength, enum, or const. | Suggestion: Add maxLength, enum, or const to string properties (CAMARA Design Guide section 2.2).

[S-312] Schema of type string must specify maxLength, enum, or const. | Suggestion: Add maxLength, enum, or const to string properties (CAMARA Design Guide section 2.2).

[S-312] Schema of type string must specify maxLength, enum, or const. | Suggestion: Add maxLength, enum, or const to string properties (CAMARA Design Guide section 2.2).

[S-011] Property description is missing or empty: "XCorrelator.description" property must be truthy

[S-011] Property description is missing or empty: "openId.description" property must be truthy

[S-035] Notification callback content type must include 'application/cloudevents+json', found: application/json

[P-026] info.description is missing the mandatory template 'additional-error-responses'. Paste the BEGIN..END block from 'code/common/info-description-templates.yaml'. | info.description is missing the mandatory template 'authorization-and-authentication'. Paste the BEGIN..END block from 'code/common/info-description-templates.yaml'. | info.description is missing the mandatory template 'request-body-strictness'. Paste the BEGIN..END block from 'code/common/info-description-templates.yaml'. | Suggestion: Paste the missing BEGIN..END block from code/common/info-description-templates.yaml under the template name reported in the message into info.description.

[P-030] info.description uses YAML folded-scalar style ('description: >'). Line-anchored BEGIN/END markers for mandatory templates are flattened by the parser and will not be detected. | Suggestion: Change 'description: >' to 'description: |' so line-anchored mandatory-template markers survive YAML parsing.