[Feature request]: Enable viewing raw response bodies for failing Uptime Monitors

### Problem Statement

Currently, when an Uptime Monitor check fails, users cannot see the full response body. This makes diagnosing API failures, HTML errors, or other server-side issues cumbersome.

### Solution Brainstorm

_No response_

### Product Area

Crons

Start by locating the Uptime Monitor implementation within the Crons product area and inspect how failed checks currently record or display responses. No files, tests, or entry points are named, so first identify the relevant backend and UI paths and their existing test coverage. Done means users can view the full response body for a failed monitor check.

Written by the indexing model from the issue text.