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Translate every filter on top of a group to HAVING in toAst (#205)

* Translate every filter on top of a group to HAVING in toAst

Previously, only filters mentioning an aggregate variable were turned into
HAVING conditions, other filters above a group were emitted as a FILTER in
the WHERE clause, i.e. evaluated before grouping. Filters directly on top of
a group (possibly through other such filters) are now collected in the
context and always become HAVING conditions. This replaces filterReplace and
objectContainsVariable.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* Restore filterReplace and objectContainsVariable as deprecated

Keep them exported and part of the SPARQL 1.1 toAst builder with their
previous behaviour to avoid an API break. They are no longer used internally
since HAVING conditions are collected by translateAlgFilter.

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