[Epic] Integrate EAP and Explore with Dashboards

[ale-cota]

Problem

Customers using Insights find value in the curated key metrics but seek more flexibility, such as deeper insights (e.g., filtering database queries by specific tables) and the ability to create cross-domain overviews (e.g., combining data from Web Vitals, Assets, and Requests for holistic analysis).

High Level Solution

Enable customers to create widgets within custom dashboards based on their Insights data within Transactions dataset

PRD: https://www.notion.so/sentry/Insights-Data-in-Dashboards-992e029307c343a4ae7b7edd1a5d7d9c