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Just to make modifications to analysis sequences more easy to do for
the user.

On request of @jburr to make this easier to understand and teach for
beginners.  Note that this involved a fair amount of whitespace
changes to make the for-body indentation consistent with the rest of
each file.

Essentially when we are using a decoration handle we should not need
to make a copy, but be able to directly decorate the input object.

There are probably other common CP algorithms that could be switched
from `SysCopyHandle` to `SysReadHandle`, but this is the lowest
hanging fruit.

The ultimate goal here is to have the python configurable no longer
inherit from the C++ object, and instead create the C++ object only at
the moment when it is needed, instead of having it as a base class and
performing all updates simultaneously to the python object and the C++
object (to keep them in sync).  However, for now it mostly adds an
alternate way of adding algorithms to jobs, to actually make the more
fundamental change to the configurables would require all users to
update to the new formalism of adding algorithms to jobs.

This also allows additional configurable objects to be used, e.g. I
now treat algorithm sequences and algorithms the same.

This could potentially also be used to change the target or mechanism
of configuration at some point, e.g. to push this into an intermediate
JSON file, but that's not an immediate goal.

For now this just replaces the algorithm with a service, and
communicates the systematics list via the service interface instead of
via the event store.

The plan is to add more functionality in future merge requests that
will move a lot of the systematics handling functionality from the
configuration layer into the service.

Update TauAnalysisAlgorithmsDict.h, DiTauSmearingAlg is skipped
pending TauTruthMatchingTool migration

Adding comment to unit test which is temporarily not being
used.

Adding ifdef statement to DiTauSmearingAlg so that it is
skipped in compilation. The Alg should be brought back
after TauAnalysisTools migration from R21.2

Removing unit tests which depend on TauTruthMatchingTools which
is not yet migrated.

TauAnalysisAlgorithms/DiTauSmearingAlg.cxx depends
on DiTauSmearingAlg which is not migrated from R21.2 yet.
This fix removes the DiTauSmearingAlg from compilation,
which should be added back once TauAnalysisTools is
properly migrated.

Originally I had tried sweeping/cherry-picking this from 21.2, but
with all the three-way merges and commits that involve other
packages/directories that was rather painful, so this is now just a
direct copy from the current state in 21.2.