Using --skip-backup doesn't seem to work

[sunandabalu]

Discussed in #689

^{Originally posted by vladik-hbinov July 8, 2021}
Tried using --non-interactive and --skip-backup and it didn't work so I tried in interactive mode and --skip-backup still doesn't work... What am I missing?

dotnet --version
6.0.100-preview.5.21302.13

dotnet --list-sdks
2.1.700 [C:\Program Files\dotnet\sdk]
2.1.701 [C:\Program Files\dotnet\sdk]
2.1.816 [C:\Program Files\dotnet\sdk]
3.1.301 [C:\Program Files\dotnet\sdk]
3.1.410 [C:\Program Files\dotnet\sdk]
5.0.103 [C:\Program Files\dotnet\sdk]
5.0.104 [C:\Program Files\dotnet\sdk]
5.0.203 [C:\Program Files\dotnet\sdk]
5.0.204 [C:\Program Files\dotnet\sdk]
5.0.301 [C:\Program Files\dotnet\sdk]
6.0.100-preview.5.21302.13 [C:\Program Files\dotnet\sdk]

upgrade-assistant --version
0.2.233001+35adc897e301310ecfad763e8ce73fdb6eb87aeb

[sunandabalu]

Clearly --skip-backup is not propagating, I tried with the latest from AzDO feed as well and am able to repro it.