Mock working directory for extract test

Prior to this change, this test would create files in the project
directory. This can cause issues with Gradle caching and up-to-date
checks.

To address this, the value of the working directory is mocked to a
temporary directory like all the other tests.

See gh-37395

spring-boot-project/spring-boot-tools/spring-boot-jarmode-layertools/src/test/java/org/springframework/boot/jarmode/layertools/ExtractCommandTests.java

@@ -167,6 +167,7 @@ class ExtractCommandTests {
 			}
 		});
 		given(this.context.getArchiveFile()).willReturn(this.jarFile);
+		given(this.context.getWorkingDir()).willReturn(this.extract);
 		assertThatIllegalStateException()
 			.isThrownBy(() -> this.command.run(Collections.emptyMap(), Collections.emptyList()))
 			.withMessageContaining("Entry 'e/../../e.jar' would be written");