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.PostgreSql.Tests/PostgreSql/StatementReaderTests.cs

@@ -95,7 +95,7 @@ public class StatementReaderTests
         }
 
         // Assert
-        Assert.That(tokens.Count, Is.GreaterThan(0));
+        Assert.That(tokens, Is.Not.Empty);
         var paramTokens = tokens.Where(t => t.Type == TokenType.Parameter).ToList();
         Assert.That(paramTokens, Has.Count.EqualTo(2));
         Assert.Multiple(() =>
@@ -173,7 +173,7 @@ public class StatementReaderTests
         }
 
         // Assert
-        Assert.That(tokens.Count, Is.GreaterThan(0));
+        Assert.That(tokens, Is.Not.Empty);
     }
 
     [Test]
@@ -191,7 +191,7 @@ public class StatementReaderTests
         }
 
         // Assert
-        Assert.That(tokens.Count, Is.GreaterThan(0));
+        Assert.That(tokens, Is.Not.Empty);
     }
 
     [Test]
@@ -229,6 +229,6 @@ public class StatementReaderTests
 
         // Assert
         var numberTokens = tokens.Where(t => t.Type == TokenType.Number).ToList();
-        Assert.That(numberTokens.Count, Is.GreaterThan(0));
+        Assert.That(numberTokens, Is.Not.Empty);
     }
 }