Unify headers already sent/session already started error handler #16451
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Unifies the error formatting for when a session was already started or headers were already sent in ext/session. This is an evolution of GH-16378, motivated by the fact some places were neglected with the additional checks. The additional checks add a lot of noise, so it's turned into a function.
This doesn't change control flow, as the error conditions as well as if any deinit needs to be happen is different per call site.