Fix member attribute default settings

[garrrikkotua]

Changes proposed ✍️

What

🤖[deprecated] Generated by Copilot at 4d1f468

Handle JSON string values for member attributes in data sink worker. Add parsing logic and error logging to memberAttribute.service.ts.
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🤖[deprecated] Generated by Copilot at 4d1f468

value is a string
try to parse as JSON object
log error in fall

Why

How

🤖[deprecated] Generated by Copilot at 4d1f468

• Add a condition to parse attribute values as JSON if they are strings (link)

Checklist ✅

• Label appropriately with Feature, Improvement, or Bug.
• Add screenshots 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.