ooo: Request textDocument/completion failed with message: Maximum call stack size exceeded: Error: Request textDocument/completion failed with message: Maximum call stack size exceeded

**Describe the bug**

Extension is running out of memory sometimes:

```
2024-07-31 13:08:28.569 [error] Request textDocument/completion failed with message: Maximum call stack size exceeded: Error: Request textDocument/completion failed with message: Maximum call stack size exceeded
at /Users/ssbarnea/.vscode/extensions/github.vscode-github-actions-0.26.3/dist/extension-node.js:2:633457
at /Users/ssbarnea/.vscode/extensions/github.vscode-github-actions-0.26.3/dist/extension-node.js:2:633751
at Timeout._onTimeout (/Users/ssbarnea/.vscode/extensions/github.vscode-github-actions-0.26.3/dist/extension-node.js:2:634113)
at listOnTimeout (node:internal/timers:573:17)
at process.processTimers (node:internal/timers:514:7)
2024-08-01 13:33:57.033 [error] [Extension Host] Error loading yaml file
```

**To Reproduce**
Steps to reproduce the behavior:
1. With this workflow '...'
2. Do this '...'
3. See error

**Expected behavior**
A clear and concise description of what you expected to happen.

**Screenshots**
If applicable, add screenshots to help explain your problem.

**Extension Version**
`v0.26.3`

**Additional context**

That is on a 64GB M1 max laptop, so bit unexpected. I wonder if that is caused by node running out of memory as I encountered recently another issue with it that required me to add `NODE_OPTIONS=--max-old-space-size=4096` in order to just run `yarn webpack`... :p

從 dist/extension-node.js 的堆疊追蹤中回報的 textDocument/completion 失敗和 YAML 載入錯誤開始。由於報告中的重現步驟只是預留位置，請使用實際工作流程重現問題，然後追蹤 completion 請求，直到找出呼叫堆疊或記憶體的增長。完成的條件是 completion 不再超出呼叫堆疊，且 YAML 檔案能夠成功載入。

由索引模型根據 Issue 內容生成。