fix: Prevent invalid SQL when sorting by non-grouped columns

[sentry]

This PR addresses a ProgrammingError that occurs when users attempt to sort chart data by a column that is neither a selected metric nor a dimension in the aggregated query.

Problem:
The apply_chart_sorting function in charts_service.py would add any non-metric sort column directly to the ORDER BY clause of the generated SQL. If this column was not also present in the GROUP BY clause or used in an aggregate function, PostgreSQL would raise a GroupingError. For example, sorting by financial_label when only start_date was grouped would lead to invalid SQL like GROUP BY start_date ORDER BY financial_label.

Solution:
The apply_chart_sorting function has been updated to validate non-metric sort columns. Before adding a column to the ORDER BY clause, it now checks if the column is either a metric alias or one of the chart's normalized dimension columns. If the sort column does not match any of these, it is skipped, and a warning is logged. This ensures that only valid columns are included in the ORDER BY clause, preventing the generation of invalid SQL and resolving the GroupingError.

Fixes DALGO-BACKEND-27J

[sentry]

Codecov Report

❌ Patch coverage is 0% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 58.64%. Comparing base (75cb6fd) to head (c5697b0).

Files with missing lines	Patch %	Lines
ddpui/core/charts/charts_service.py	0.00%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1370      +/-   ##
==========================================
- Coverage   58.66%   58.64%   -0.03%     
==========================================
  Files         132      132              
  Lines       15690    15696       +6     
==========================================
  Hits         9205     9205              
- Misses       6485     6491       +6     

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