[MVM] Giants do not resist Scorch Shot/Loose Cannon knockback

Description

Video in screenshot section Giants have an innate resistance to knockback from certain weapons like the Scorch Shot, Loose Cannon and Force A Nature

In the Gun Mettle update, the Scorch Shot was changed, and this unintentionally affected how Giants are affected by said knockback. This was then (sort of) fixed in the September 24, 2015 patch "Fixed a push bug with The Scorch Shot and giant robots in Mann vs. Machine mode." Although, this didn't entirely fix the issue, as you could still use it to stun giants, it was serviceable.

Then the Tough Break update released with the following change "Consecutive Airblasts will no longer prevent enemies from air-strafing until they touch the ground "

This reverted the previous fix, while making the problem even worse than before, as you could now send giant robots flying with relative ease, and this also bypasses ubercharge

Checklist

[x] None of the open or closed issues document this problem.
[x] This is a bug, not a new idea.
[x] This is objectively a bug, and not something that people commonly disagree on.
[x] This bug is in the code of the game, not in the textures, sounds, or other resources.
[x] This issue occurs on the latest vanilla TF2 update.
[ ] This issue is listed on the Source 1 official bugtracker.
[ ] This issue occurs with DirectX level 100.
[x] This issue occurs on the latest Team Comtress release, or the master branch.
[x] This issue occurs when using no custom content.
[x] This issue occurs when using start_tf2.bat (or start_server.bat) with no custom launch options.
[x] This issue occurs when using a listen server (using the map command ingame).
[x] This issue occurs when using a dedicated server.
[ ] This bug is in the internal procedures or tooling (e.g. the build process).

Reproduction

Use Scorch Shot/Loose Cannon vs. any giant robot, and ubered robot

Screenshots

https://youtu.be/2pd0VF-PY7A Video for reference

mastercomfig / tf2-patches