Investigate further inlier ratio w.r.t. GT model and w.r.t estimated model

Currently, the inlier ratio with respect to GT model is greater than that with respect to estimated model for USAC. This is perhaps expected, as the GT should explain the data most appropriately. But our inability to estimate a model with close to as many inliers is unfortunate, and perhaps could be explored further on some representative image pairs.

We see this with USAC on Skydio-8:

However, we do not see this with LORANSAC on Skydio-8

cc @akshay-krishnan @ayushbaid

Compare the USAC and LORANSAC evaluation paths on the Skydio-8 image pairs, using the attached plots as the baseline. Determine why estimated-model inlier ratios diverge from ground-truth-model ratios and document a reproducible finding; the issue names no files or tests, and an open linked pull request indicates that work is already underway.

Written by the indexing model from the issue text.