Fixes #62097: infinite loop in animation compress due to too small page size

Fixed an infinite loop caused when given page size is too small to store anything.

If, in the first step of compression, we attempt a rollback, we end up calling LocalVector::resize with AnimationCompressionDataState::validated_packet_count which is -1.  This resize function takes a uint, and there's a bitshift operation that assumes that by bitshifting enough times, we'll reach a number greater than or equal to the requested memory amount, which we'll never do for uint(-1), and this causes an infinite loop.

To fix, I'm adding an early failure in case the given page size isn't enough.

scene/resources/animation.cpp

@@ -4619,6 +4619,7 @@ void Animation::compress(uint32_t p_page_size, uint32_t p_fps, float p_split_tol
 	data_tracks.resize(tracks_to_compress.size());
 	time_tracks.resize(tracks_to_compress.size());
 
+	uint32_t needed_min_page_size = base_page_size;
 	for (uint32_t i = 0; i < data_tracks.size(); i++) {
 		data_tracks[i].split_tolerance = p_split_tolerance;
 		if (track_get_type(tracks_to_compress[i]) == TYPE_BLEND_SHAPE) {
@@ -4626,7 +4627,12 @@ void Animation::compress(uint32_t p_page_size, uint32_t p_fps, float p_split_tol
 		} else {
 			data_tracks[i].components = 3;
 		}
+		needed_min_page_size += data_tracks[i].data.size() + data_tracks[i].get_temp_packet_size();
 	}
+	for (uint32_t i = 0; i < time_tracks.size(); i++) {
+		needed_min_page_size += time_tracks[i].packets.size() * 4; // time packet is 32 bits
+	}
+	ERR_FAIL_COND_MSG(p_page_size < needed_min_page_size, "Cannot compress with the given page size");
 
 	while (true) {
 		// Begin by finding the keyframe in all tracks with the time closest to the current time