Add changie-validation job to lint workflow

* Add `changie-validation` job to check for changie entries in `.changes/unreleased` directory
* Skip `changie-validation` job if `.changes` directory does not exist or if labels `no-changie-required` or `dependencies` are set
* Replace deprecated `set-output` command with `echo "{name}={value}" >> $GITHUB_OUTPUT`
* Add comment using gh cli if changie entry is required, ensuring only a single comment is made
* Map `GH_TOKEN` in `env` for `check_labels` and `validate_changie_entry` steps

.github/workflows/lint.yml

@@ -72,8 +72,11 @@ jobs:
               echo "dependencies=true" >> $GITHUB_OUTPUT
             fi
           done
-
+        with:
+          env:
+            GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
       - name: Validate changie entry
+        id: validate_changie_entry
         if: steps.check_changes_dir.outputs.changes_dir_exists == 'true' && steps.check_labels.outputs.no_changie_required == 'false' && steps.check_labels.outputs.dependencies == 'false'
         run: |
           if [ -z "$(ls -A .changes/unreleased)" ]; then
@@ -83,3 +86,6 @@ jobs:
           else
             echo "Changie entry found"
           fi
+        with:
+          env:
+            GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}