New Dispatcher methods to set Controller/FrontController

[Markus-Gurkcity]

Questions	Answers
Branch?	develop / 8.1.x
Description?	Add setController/setFrontController methods to avoid bug in hookActionAfterLoadRoutes that protected variables can be set in Dispatcher
Type?	bug fix
Category?	CO
BC breaks?	no
Deprecations?	no
How to test?	We have a module that wants to make an own Dispatch and needs to pass the information about the dispatched routes to the default PS Dispatcher in Hook actionAfterLoadRoutes. For this reason the protected variables "$controller" and "$front_controller" needs to be public or alternatively a setter methods is needed. Currently this can be only achieved with an Override of Dispatcher. You can read here how to test in deatil: #35971
UI Tests	Please run UI tests and paste here the link to the run. Read this page to know why and how to use this tool..
Fixed issue or discussion?	Fixes #35971
Related PRs
Sponsor company	Gurkcity

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