[Data Grid] Fix filter datetime with seconds

[siriwatknp]

closes #19974

Root Cause

The buildApplyFilterFn function in packages/x-data-grid/src/colDef/gridDateOperators.ts truncates seconds from both the filter value and row value before comparison for dateTime columns.

For equality operators (is, not), this is correct - comparing 7:30:00 to 7:30:30 should match since users can't input seconds in the filter UI.

But for comparison operators (after, before, onOrAfter, onOrBefore), truncating the row value causes incorrect filtering:

1. User filters: "is after 02:09 PM"
2. Filter value: 02:09:00 (seconds truncated - correct)
3. Row value: 02:09:56 → truncated to 02:09:00 (wrong!)
4. Comparison: 02:09:00 > 02:09:00 = false → row incorrectly excluded

// Before fix - row seconds were always truncated
return (value: Date): boolean => {
  const dateCopy = new Date(value);
  if (showTime) {
    dateCopy.setSeconds(0, 0); // Bug: truncates 02:09:56 to 02:09:00
  }
  return compareFn(dateCopy.getTime(), time);
};

Solution

Pass keepRawComparison=true (renamed from keepHours for clarity) for comparison operators to skip row value normalization.
Updated comparison operators to pass keepRawComparison:

{
  value: 'after',
  getApplyFilterFn: (filterItem) => {
    return buildApplyFilterFn(filterItem, (v1, v2) => v1 > v2, showTime, showTime);
  },                                            // keepRawComparison=true for dateTime ↑
},
{
  value: 'onOrAfter',
  getApplyFilterFn: (filterItem) => {
    return buildApplyFilterFn(filterItem, (v1, v2) => v1 >= v2, showTime, showTime);
  },
},
{
  value: 'before',
  getApplyFilterFn: (filterItem) => {
    return buildApplyFilterFn(filterItem, (v1, v2) => v1 < v2, showTime, true);
  },                                                           // always true ↑
},
{
  value: 'onOrBefore',
  getApplyFilterFn: (filterItem) => {
    return buildApplyFilterFn(filterItem, (v1, v2) => v1 <= v2, showTime, showTime);
  },
},

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[mui-bot]

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Bundle size report

Bundle	Parsed size	Gzip size
@mui/x-data-grid	🔺+6B(0.00%)	🔺+4B(0.00%)
@mui/x-data-grid-pro	🔺+6B(0.00%)	🔺+4B(0.00%)
@mui/x-data-grid-premium	🔺+6B(0.00%)	🔺+3B(0.00%)
@mui/x-charts	0B(0.00%)	0B(0.00%)
@mui/x-charts-pro	0B(0.00%)	0B(0.00%)
@mui/x-charts-premium	0B(0.00%)	0B(0.00%)
@mui/x-date-pickers	0B(0.00%)	0B(0.00%)
@mui/x-date-pickers-pro	0B(0.00%)	0B(0.00%)
@mui/x-tree-view	0B(0.00%)	0B(0.00%)
@mui/x-tree-view-pro	0B(0.00%)	0B(0.00%)

Details of bundle changes

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