Don't use hash grouping w/o keys in chunkwise aggregation

[akuzm]

In chunkwise aggregation paths, we cannot use hash aggregation in FinalizeAggregate without grouping, because it leads to a wrong result in case when there are no input rows. Use the strategy type flags set by the Postgres planner.

Disable-check: force-changelog-file

[codecov]

Codecov Report

Attention: Patch coverage is 25.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 82.23%. Comparing base (59f50f2) to head (7e41712).
Report is 673 commits behind head on main.

Files with missing lines	Patch %	Lines
tsl/src/chunkwise_agg.c	25.00%	0 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7552      +/-   ##
==========================================
+ Coverage   80.06%   82.23%   +2.16%     
==========================================
  Files         190      238      +48     
  Lines       37181    43716    +6535     
  Branches     9450    10968    +1518     
==========================================
+ Hits        29770    35949    +6179     
- Misses       2997     3432     +435     
+ Partials     4414     4335      -79     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.