Improves the infrastructure to mark representations modified only when
necessary. Current implementation (via
vtkSMProxyProperty::SkipDependency) was error prone. Now,
vtkSMRepresentationProxy is smarter at deciding is the proxy is being
dirtied via a upstream pipeline connection or something else.

This was done by adding new API (vtkSMProxy::MarkDirtyFromProducer)
which has relevant information available to representation to determine
which producer connection the dirty notification is coming from.

This helps use avoid clearning animation cache for representation
property changes that should only affect rendering (not data
processing). Fixes #18275.

Futhermore, all representations now have `DebugName` which is handy
string that helps identify a representation proxy making it clear which
source's what representation is corresponds to.

vtkSMProxyProperty::SkipDependency (and `skip_dependency` XML attribute)
is now obsolete and no longer needed or used.