Node stack filenames should be relative to app root

### Problem Statement

Currently, the Node SDK captures absolute paths for stack trace filenames.

This has a number of disadvantages:
- Change of hosting config or provider might change the paths
- Paths differ by OS/username

These differences can impact error grouping.

### Solution Brainstorm

For the Electron SDK the OS/username in paths was a major issue so we already cater for this by normalising paths to the application root.

We should do something similar for the Node SDK but this will be a breaking change since it would affect customer error grouping.

首先定位 Node SDK 對堆疊追蹤檔名的處理，並將其與 Electron SDK 現有的 application-root 正規化進行比較。完成的標準是：Node 堆疊追蹤中的檔名是穩定的相對路徑，並且已處理 breaking change 及其對錯誤分組的影響。

由索引模型根據 Issue 內容生成。