PathWiseFootprints.js

// extract the unique row numbers from the landsat footprint collection
var unique_paths = landsat_footprints.aggregate_array('path').distinct();
print('Unique paths:', unique_paths)

// seggregate the landsat footprints by path 
var path_wise_footprints = unique_paths.map(function a(element){
  return landsat_footprints.filter(ee.Filter.eq('path', element));
});
print('Path wise footprints', path_wise_footprints)

// add the first FeatureCollection of the list to cross-check
Map.addLayer(ee.FeatureCollection(ee.List(path_wise_footprints).get(1)), {}, 'path_wise_footprints')