Use `.dotnet` instead of `.net` for single file applications in .NET 7

[omajid]

See: #35221 (comment)

Single file apps extract to $HOME/.net, instead of using on one of the already-common directories like $HOME/.dotnet or even $XDG_CACHE_HOME (with fallback to $HOME/.cache).

For .NET 7, we should try and fix this and use $HOME/.dotnet instead of adding one more dot-directory to the user's home.

I couldn't figure out the best area label to add to this issue. If you have write-permissions please help me learn by adding exactly one area label.

[omajid]

cc @vitek-karas

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Issue Details

---

See: #35221 (comment)

Single file apps extract to $HOME/.net, instead of using on one of the already-common directories like $HOME/.dotnet or even $XDG_CACHE_HOME (with fallback to $HOME/.cache).

For .NET 7, we should try and fix this and use $HOME/.dotnet instead of adding one more dot-directory to the user's home.

Author:	omajid
Assignees:	-
Labels:	area-Single-File, untriaged
Milestone:	-

[tmds]

$XDG_CACHE_HOME (with fallback to $HOME/.cache).

+1, this is the most appropriate location for this type of files.

e.g. $XDG_CACHE_HOME/dotnet/app-extract