[red-knot] reveal-type should return the revaled type (#17007)

## Summary

Return the revealed-type from the monkey-patched `revale_type`
implementation to
preserve the identity behavior.

This PR also isolates different script runs by assigning a different
`globals` dict for each script-run. See
https://github.com/pyodide/pyodide/issues/703

.github/workflows/publish-knot-playground.yml

@@ -8,10 +8,10 @@ on:
     branches: [main]
     paths:
       - "crates/red_knot*/**"
-      - "crates/ruff_db"
-      - "crates/ruff_python_ast"
-      - "crates/ruff_python_parser"
-      - "playground"
+      - "crates/ruff_db/**"
+      - "crates/ruff_python_ast/**"
+      - "crates/ruff_python_parser/**"
+      - "playground/**"
       - ".github/workflows/publish-knot-playground.yml"
 
 concurrency: