ci: make schema inspector non-blocking for expected WP changes

WordPress 6.9 introduces expected schema changes (new blocks, changed
field types, removed templates). The schema inspector should report
these changes for release notes, but not block CI.

Author: josephfusco

.github/workflows/schema-linter.yml

@@ -78,6 +78,7 @@ jobs:
           path: /tmp/schema.graphql
 
       - name: Run Schema Inspector
+        continue-on-error: true
         run: |
           # This schema and previous release schema
           node_modules/.bin/graphql-inspector diff /tmp/${{ steps.get-latest-tag.outputs.tag }}.graphql /tmp/schema.graphql