WithSecurityContextTestExecutionListener should respect NestedTestConfiguration

[rwinch]

Describe the bug

In the following code testNoAnnotation should not use @WithMockUser because the mode is EnclosingConfiguration.OVERRIDE.

	@WithMockUser
	@NestedTestConfiguration(NestedTestConfiguration.EnclosingConfiguration.OVERRIDE)
	class OverrideOuterClass {

		class InnerClass {

			void testNoAnnotation() {
			}

		}

	}

To solve this WithSecurityContextTestExecutionListener should leverage TestContextAnnotationUtils.