Revert "xds: add "resource_timer_is_transient_failure" server feature"

[shivaspeaks]

Reverts #12063

CSDS will crash if we don't update the 1:1 mapping with new status that has been defined by gRFC A88 in another section.

grpc-java/xds/src/main/java/io/grpc/xds/CsdsService.java

Lines 240 to 255 in 5a8326f

	static ClientResourceStatus metadataStatusToClientStatus(ResourceMetadataStatus status) {
	switch (status) {
	case UNKNOWN:
	return ClientResourceStatus.UNKNOWN;
	case DOES_NOT_EXIST:
	return ClientResourceStatus.DOES_NOT_EXIST;
	case REQUESTED:
	return ClientResourceStatus.REQUESTED;
	case ACKED:
	return ClientResourceStatus.ACKED;
	case NACKED:
	return ClientResourceStatus.NACKED;
	default:
	throw new AssertionError("Unexpected ResourceMetadataStatus: " + status);
	}
	}

To use new TIMEOUT status we need to do some envoy and xds proto syncs that will take some time.

[ejona86]

It's useful to describe why you are reverting something.