Removed some leaking deprecation warning in the Form component

| Q             | A
| ------------- | ---
| Fixed tickets | #7101
| License       | MIT

I have removed the error handler in the integration test case so that the testsuite can show any leaked deprecation message from the core and replaced deprecated methods in the type testcases.
This keeps only 2 cases where the handlign was needed: the test ensuring the BC for ``property_path``, and the code triggering #7101 because of its BC call