Fix organization model

[joanagmaia]

Changes proposed ✍️

What

🤖 Generated by Copilot at 42971e5

The pull request enhances the organization model by using a new class for a field with variable types. This affects the file frontend/src/modules/organization/organization-model.js.
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🤖 Generated by Copilot at 42971e5

Sing, O Muse, of the skillful coder who devised
A new class to handle fields of diverse types,
And applied it to the averageEmployeeTenure field,
That measures the loyalty of the workers in each guild.

Why

How

🤖 Generated by Copilot at 42971e5

• Import and use GenericField class to create fields with flexible types (link, link)
• Update organization-model.js to change the type of averageEmployeeTenure field from IntegerField to GenericField (link)

Checklist ✅

• Label appropriately with Feature, Improvement, or Bug.
• Add screehshots to the PR description for relevant FE changes
• New backend functionality has been unit-tested.
• API documentation has been updated (if necessary) (see docs on API documentation).
• Quality standards are met.