chore(sonar): wrap independent assertions in Assert.Multiple (NUnit2045)

Driven by `dotnet format analyzers --diagnostics NUnit2045`. The fixer
groups consecutive independent `Assert.That(...)` calls into
`Assert.Multiple(() => { ... })`, so a failing assertion no longer
short-circuits the block — every failure inside the group is reported,
which gives much better diagnostics on multi-property tests.

Audit confirmed no Assert.Throws / Assert.Fail / Assert.Catch / Assert.Pass
/ Assert.DoesNotThrow got pulled inside a Multiple block (those need to
short-circuit). All 1180 tests pass.

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

tests/Strata.SqlTools.PostgreSql.Tests/PostgreSql/StatementReaderTests.cs

@@ -23,9 +23,12 @@ public class StatementReaderTests
 
         // Assert
         Assert.That(tokens, Is.Not.Empty);
-        Assert.That(tokens[0].Type, Is.EqualTo(TokenType.LeftParenthesis));
-        Assert.That(tokens[1].Type, Is.EqualTo(TokenType.Number));
-        Assert.That(tokens[1].Value, Is.EqualTo("1"));
+        Assert.Multiple(() =>
+        {
+            Assert.That(tokens[0].Type, Is.EqualTo(TokenType.LeftParenthesis));
+            Assert.That(tokens[1].Type, Is.EqualTo(TokenType.Number));
+            Assert.That(tokens[1].Value, Is.EqualTo("1"));
+        });
     }
 
     [Test]
@@ -44,10 +47,13 @@ public class StatementReaderTests
 
         // Assert
         Assert.That(tokens, Has.Count.EqualTo(5)); // "COLUMN_1" + "COLUMN_2" * 2
-        Assert.That(tokens[0].Type, Is.EqualTo(TokenType.ColumnIdentifier));
-        Assert.That(tokens[0].Value, Is.EqualTo("COLUMN_1"));
-        Assert.That(tokens[1].Type, Is.EqualTo(TokenType.Plus));
-        Assert.That(tokens[2].Type, Is.EqualTo(TokenType.ColumnIdentifier));
+        Assert.Multiple(() =>
+        {
+            Assert.That(tokens[0].Type, Is.EqualTo(TokenType.ColumnIdentifier));
+            Assert.That(tokens[0].Value, Is.EqualTo("COLUMN_1"));
+            Assert.That(tokens[1].Type, Is.EqualTo(TokenType.Plus));
+            Assert.That(tokens[2].Type, Is.EqualTo(TokenType.ColumnIdentifier));
+        });
     }
 
     [Test]
@@ -64,11 +70,14 @@ public class StatementReaderTests
             tokens.Add((sqlReader.TokenType, sqlReader.TokenValue));
         }
 
-        // Assert
-        Assert.That(tokens[0].Type, Is.EqualTo(TokenType.ColumnIdentifier));
-        Assert.That(tokens[0].Value, Is.EqualTo("MyColumn"));
-        Assert.That(tokens[2].Type, Is.EqualTo(TokenType.ColumnIdentifier));
-        Assert.That(tokens[2].Value, Is.EqualTo("AnotherColumn"));
+        Assert.Multiple(() =>
+        {
+            // Assert
+            Assert.That(tokens[0].Type, Is.EqualTo(TokenType.ColumnIdentifier));
+            Assert.That(tokens[0].Value, Is.EqualTo("MyColumn"));
+            Assert.That(tokens[2].Type, Is.EqualTo(TokenType.ColumnIdentifier));
+            Assert.That(tokens[2].Value, Is.EqualTo("AnotherColumn"));
+        });
     }
 
     [Test]
@@ -89,8 +98,11 @@ public class StatementReaderTests
         Assert.That(tokens.Count, Is.GreaterThan(0));
         var paramTokens = tokens.Where(t => t.Type == TokenType.Parameter).ToList();
         Assert.That(paramTokens, Has.Count.EqualTo(2));
-        Assert.That(paramTokens[0].Value, Is.EqualTo("$1"));
-        Assert.That(paramTokens[1].Value, Is.EqualTo("$2"));
+        Assert.Multiple(() =>
+        {
+            Assert.That(paramTokens[0].Value, Is.EqualTo("$1"));
+            Assert.That(paramTokens[1].Value, Is.EqualTo("$2"));
+        });
     }
 
     [Test]