Remove custom assertion failure output for FileEntry in LayersTest

[chanseokoh]

We implemented FileEntry.toString() and FilePermissions.toString() in #2714. After a new jib-build-plan is released, remove the custom FileEntry output code in LayersTest.

jib/jib-cli/src/test/java/com/google/cloud/tools/jib/cli/buildfile/LayersTest.java

Lines 212 to 236 in e722ab7

	try {
	Assert.assertEquals(expectedLayerEntries, ImmutableSet.copyOf(layer.getEntries()));
	} catch (AssertionError ae) {
	System.out.println("ACTUAL");
	layer
	.getEntries()
	.forEach(
	entry -> {
	System.out.println("src: " + entry.getSourceFile());
	System.out.println("dest: " + entry.getExtractionPath());
	System.out.println("permission: " + entry.getPermissions().toOctalString());
	System.out.println("time: " + entry.getModificationTime());
	System.out.println("ownership: " + entry.getOwnership());
	});
	System.out.println("EXCPECTED");
	expectedLayerEntries.forEach(
	entry -> {
	System.out.println("src: " + entry.getSourceFile());
	System.out.println("dest: " + entry.getExtractionPath());
	System.out.println("permission: " + entry.getPermissions().toOctalString());
	System.out.println("time: " + entry.getModificationTime());
	System.out.println("ownership: " + entry.getOwnership());
	});
	throw ae;
	}