[Actions] Chore: Rename Issue Check (#5268)

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## PR-Codex overview
This PR introduces a new workflow in the `.github/workflows/linear.yml` file that ensures pull requests contain a linked issue in their body.

### Detailed summary
- Added a new workflow named `Check for linked issue in pull request body`.
- Configured the workflow to trigger on `pull_request` events.

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Author: gregfromstl

.github/workflows/linear.yml

@@ -1,4 +1,4 @@
-name: Check for "linear" in pull request body
+name: Check for linked issue in pull request body
 
 on:
   pull_request: