[WebProfilerBundle] Fix a web profiler form issue with fields added to the form after the form was built #20860
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I discovered a bug in 3.2 in the web profiler and this PR fixes it. This issue has been fixed in the past by #13166 and probably reintroduced by the refactoring we did in the WebProfiler in 3.2. I simply applied the fix to these changes.
To reproduce the original problem, simply clone the current standard edition, create a Form with a Type and add a field after its creation. Once done, try to access the Webprofiler: it will fails with the following error: