Fix triage workflow when the card already exists in project (#63347)
Summary:
Fixes issues like https://github.com/pytorch/pytorch/runs/3336787242
```
RequestError [HttpError]: Validation Failed: {"resource":"ProjectCard","code":"unprocessable","field":"data","message":"Project already has the associated issue"}
Error: Unhandled error: HttpError: Validation Failed: {"resource":"ProjectCard","code":"unprocessable","field":"data","message":"Project already has the associated issue"}
at /home/runner/work/_actions/actions/github-script/v2/dist/index.js:7531:23
at processTicksAndRejections (internal/process/task_queues.js:93:5)
at async eval (eval at callAsyncFunction (/home/runner/work/_actions/actions/github-script/v2/dist/index.js:7985:56), <anonymous>:63:1)
at async main (/home/runner/work/_actions/actions/github-script/v2/dist/index.js:8011:20) {
name: 'HttpError',
status: 422,
...
```
The card may already exist, thus no need to handle `422` status code. Anything else will re-throw the err.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/63347
Reviewed By: malfet
Differential Revision: D30348529
Pulled By: zhouzhuojie
fbshipit-source-id: 36647837bfccad43ce01eb5dfe6642e685615037
