feat(dashboard-lib): Make stats and pie widgets using real data from the backend

[samirtechlab]

Issue

https://gravitee.atlassian.net/browse/GKO-1897

Description

Make the Stats and Pie Widgets use the real data from the backend.

[gemini-code-assist]

Summary of Changes

Hello @samirtechlab, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the dashboard's analytics viewer by integrating real-time data from the backend into the Stats Widget. It also improves code maintainability by removing redundant imports and standardizing metric names, and adds a base URL configuration for easier deployment across different environments.

Highlights

• Real Data Integration: The Stats Widget now utilizes real data fetched from the backend, enhancing the accuracy and relevance of displayed information.
• Base URL Configuration: The component is now configured to use a base URL, facilitating easier environment configuration and API endpoint management.
• Code Cleanup: Unnecessary enum imports and metric/measure names have been removed from multiple files, streamlining the codebase.
• Formatting: Stats are now formatted according to locale.

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[gemini-code-assist]

Code Review

This pull request successfully connects the stats widget to use real data from the backend by introducing a baseURL, updating the dashboard service to perform HTTP requests, and adding a converter for data formatting. The refactoring of enums to string literal types across the dashboard library is a solid improvement for type safety and consistency with API data. My review includes feedback on a few points to improve robustness and maintainability: a risky change to a type guard, a hardcoded URL that should be configurable, a misplaced CSS rule, a misleading method name, and a suggestion to improve data formatting precision.

[jourdiw]

LGTM 😎
Maybe injection tokens could be an interesting strategy for the baseUrl 🤔