Add syntax check on the changelog action

### 📝 Description of the feature

One of our PyMAPDL PR has the following name:

```md
fix: Improve error handling in *GET method and enhance output logging
```

which triggers a formatting error when releasing.

Ideally, we would like to catch those errors on the PR itself.

Ref: https://github.com/ansys/pymapdl/pull/3758

### 💡 Steps for implementing the feature

_No response_

### 🔗 Useful links and references

_No response_

Start by inspecting the changelog action and the formatting failure described in ansys/pymapdl#3758. Reproduce the invalid PR-title case, then add a check that reports the error during the pull request workflow and verify that valid changelog syntax still passes.

Written by the indexing model from the issue text.