fix: Prevent SubqueryAlias to be pushed past FilterExec when unparsing

[nuno-faria]

Which issue does this PR close?

• Closes Unparsing of filter on subquery generates invalid SQL #25545.

Rationale for this change

Pushing a SubqueryAlias past a FilterExec can make the predicate refer to an invalid table name. This PR simply avoids that and keeps the subquery.

What changes are included in this PR?

• Table is not aliased from a SubqueryAlias when there is a FilterExec below it.

What is the testing strategy for this PR?

Unit test.

Are there any user-facing changes?

No.

[nuno-faria]

I did not add the Filter directly to requires_derived_subquery since technically the filter does not need it, but we can't also alias the table.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.41%. Comparing base (99af44a) to head (c6e3cf7).

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #25547      +/-   ##
==========================================
- Coverage   82.41%   82.41%   -0.01%     
==========================================
  Files        1138     1138              
  Lines      435299   435299              
  Branches   435299   435299              
==========================================
- Hits       358749   358742       -7     
- Misses      54840    54848       +8     
+ Partials    21710    21709       -1     

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