[clang-tidy] do not diagnose array types within implicit instantiations of a template (#132924)

So far, the clang-tidy check `modernize-avoid-c-arrays` also diagnosed
array types for type template parameters even though no actual array
type got written there but it got deduced to one. In such case, there is
nothing a developer can do at that location to fix the diagnostic. Since
in this case, the location where the template got actually instantiated
would have to be adjusted. And this is in most cases some totally
distant code where implementers of a template do not have access to.
Also adding suppressions to the declaration of the template is not an
option since that would clutter the code unnecessarily and is in many
cases also simply not possible (e.g. for users of a template). Hence, we
propose to not diagnose any occurrence of an array type in an implicit
instantiation of a template but rather at the point where template
arguments involve array types.

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