[HttpFoundation] Revert " Emit PHP warning when Response::sendHeaders()
is called while output has already been sent"
#60875
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This reverts commit cf554e1, reversing changes made to 392d0c9.
Let's revert as this change is too disruptive for a minor version (and I'm also going to replace this by a deprecation on 7.4 so that we can throw the warning in 8.0)