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Fix link issues with ConstantImplicitBackend and CompositeImplicitBackend

Linker complained that a symbol was redefined when using these classes in a target while also linking against CommonCore: LNK2005 "vtkConstantImplicitBackend" already defined in vtkToImplicitRamerDouglasPeuckerStrategy.obj This was caused by an explicit instanciation without proper extern template declaration.

Fixes #19068 (closed)

Backport: release

FYI @julien.fausty @ben.boeckel @mwestphal @amaclean

Edited by Alexy Pellegrini

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