chore(sonar): second sweep — catch .Length, Is.Not.Empty, and newly-exposed Multiple groups (NUnit2046, NUnit2045)

Re-runs `dotnet format analyzers --diagnostics NUnit2046 NUnit2045` after
the Tier 2 Assert.Multiple wrap, which exposed:

- `Has.Length.EqualTo(n)` rewrites for `string[]`/array `.Length` checks
  (the first pass only knew about `.Count`).
- `Is.Not.Empty` rewrites for `Count, Is.GreaterThan(0)`.
- A handful of new NUnit2045 groups that became wrappable once the
  initial Multiple blocks settled the surrounding indentation.

Tests still 1180/1180 passing.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

tests/Strata.SqlTools.SqlServer.Tests/SqlServer/QueryBreakdownCollectionTests.cs

@@ -360,7 +360,7 @@ public class QueryBreakdownCollectionTests
         var report = _collection.GetParameterUsageReport().ToList();
 
         // Assert
-        Assert.That(report.Count, Is.GreaterThan(0));
+        Assert.That(report, Is.Not.Empty);
         var userIdReport = report.FirstOrDefault(r => r.ParameterName == "UserId");
         Assert.That(userIdReport, Is.Not.Null);
         Assert.That(userIdReport?.UsedInQueryCount, Is.EqualTo(2));

tests/Strata.SqlTools.SqlServer.Tests/SqlServer/QueryBreakdownTests.cs

@@ -29,9 +29,12 @@ public class QueryBreakdownTests
             Assert.That(query.FinishClauses, Is.Not.Null);
             Assert.That(query.WithClauses, Is.Not.Null);
         });
-        Assert.That(query.WithClauses, Is.Empty);
-        Assert.That(query.Parameters, Is.Not.Null);
-        Assert.That(query.ParameterList, Is.Not.Null);
+        Assert.Multiple(() =>
+        {
+            Assert.That(query.WithClauses, Is.Empty);
+            Assert.That(query.Parameters, Is.Not.Null);
+            Assert.That(query.ParameterList, Is.Not.Null);
+        });
     }
 
     [Test]
@@ -778,10 +781,13 @@ public class QueryBreakdownTests
             Assert.That(withIndex, Is.GreaterThan(-1));
             Assert.That(mainSelectIndex, Is.GreaterThan(-1));
         });
-        Assert.That(withIndex, Is.LessThan(mainSelectIndex));
+        Assert.Multiple(() =>
+        {
+            Assert.That(withIndex, Is.LessThan(mainSelectIndex));
 
-        // Assert - Verify CTE definition
-        Assert.That(sql, Does.Contain("ProductTotals"));
+            // Assert - Verify CTE definition
+            Assert.That(sql, Does.Contain("ProductTotals"));
+        });
         Assert.That(sql, Does.Contain("AS"));
         Assert.That(sql, Does.Contain("ProductID"));
         Assert.That(sql, Does.Contain("TotalQuantity"));