Allow TestCompiler SourceFile to work with records

Update `SourceFile` to try a regex replace to make `record` files look
like regular classes.

Closes gh-29236

spring-core-test/src/test/java/org/springframework/core/test/tools/SourceFileTests.java

@@ -119,6 +119,33 @@ class SourceFileTests {
 		assertThat(sourceFile.getContent()).isEqualTo(HELLO_WORLD);
 	}
 
+	@Test
+	void getClassNameFromSimpleRecord() {
+		SourceFile sourceFile = SourceFile.of("""
+				package com.example.helloworld;
+
+				record HelloWorld(String name) {
+				}
+				""");
+		assertThat(sourceFile.getClassName()).isEqualTo("com.example.helloworld.HelloWorld");
+	}
+
+	@Test
+	void getClassNameFromMoreComplexRecord() {
+		SourceFile sourceFile = SourceFile.of("""
+				package com.example.helloworld;
+
+				public record HelloWorld(String name) {
+
+					String getFoo() {
+						return name();
+					}
+
+				}
+				""");
+		assertThat(sourceFile.getClassName()).isEqualTo("com.example.helloworld.HelloWorld");
+	}
+
 	/**
 	 * JavaPoet style API with a {@code writeTo} method.
 	 */