Provide a Chameleon specific version of SkinTemplateOutputPageBeforeExec
SkinTemplateOutputPageBeforeExec is deprecated but BlueSpice uses this
hook to communicate with Chameleon skin. A new hook is provided to allow
this integrate to continue with minimal disruption.
This hook will be present in Chameleon 3.0.1+ Until we are able to
update to this version this hook is added into Calumma
(cherry picked from commit f3f3cc72c73dfeda807f495be4e88ba31b348aaa)