Robbie Averill 41dc9229bf FIX Reverting ExtensionTestState and Extensible extra methods modifications to prevent PHP 5.6 segfault (#8581)
* API Revert addition of Extensible::flush_extra_methods_cache() and change to ExtensionTestState

This reverts the changes from #8465 and #8505 that relate to ExtensionTestState and the
tracking of extra methods between unit tests. The existing test from #8465 testing
overloaded Extensions after extra_methods are populated has been updated to show that you
must re-add the extension to flush the extra_methods cache if you need this behaviour.

* Revert change to InjectorTest::testExtendedExtensions

* Revert "Add failing test to show that overloaded extensions are broken in Extensible"

This reverts commit 55e79ffdfdd7101825e20fb4585e98ab554bd006.

* DOCS Add docs for extending extensions, and upgrade guide note to 4.3 to avoid using PHP config to do so
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