Issue #SBCOSS-00: Remove fields from activityConfig.json to remove bgms hardcoding

[chethann007]

Summary

This PR removes the restriction of returning only specific fields from the service when reading activity data.
The hardcoded bgms fields have also been removed to make the configuration more flexible.

Changes

• Updated logic to return all keys and values from the search-service instead of specific fields.
• Removed bgms hardcoding from activityConfig.json.

Description by Korbit AI

What change is being made?

Remove the hardcoded field definitions from activityConfig.json by setting "fields" to an empty array for the activities configuration.

Why are these changes being made?

To stop hardcoding fields (bgms related) and allow dynamic/default field handling as part of Issue SBCOSS-00.

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[korbit-ai]

I've completed my review and didn't find any issues... but I did find this kitten.

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[sonarqubecloud]

Quality Gate failed

Failed conditions
1 Security Hotspot
13.8% Coverage on New Code (required ≥ 80%)
3.7% Duplication on New Code (required ≤ 3%)
E Reliability Rating on New Code (required ≥ A)

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[Copilot]

Pull Request Overview

This PR removes hardcoded field definitions from the activity configuration to enable more flexible data retrieval. Instead of restricting the service to return only specific predefined fields, it now allows all available fields to be returned dynamically.

• Removed hardcoded field restrictions from activity configuration
• Changed from specific field listing to empty array for dynamic field retrieval
• Eliminates bgms-related hardcoding for improved configurability

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