* fix(manager/nuget): optimize xml error handling

* Update lib/modules/manager/nuget/package-tree.spec.ts

Co-authored-by: Sergei Zharinov <zharinov@users.noreply.github.com>

Co-authored-by: Sergei Zharinov <zharinov@users.noreply.github.com>

* refactor: fix nullable types

* chore: revert changes

* chore: fix lint comments

* chore: revert changes

Moves datasource, manager, platform and versioning code from lib/ into new lib/modules/

BREAKING CHANGE: External tools must update paths to datasource, manager, platform and versioning

Co-authored-by: Michael Kriese <michael.kriese@visualon.de>

* refactor(datasource/nuget): Convert to class

* Fix strict nulls and obsolete URL

* Fixes

* Fix mutability

Co-authored-by: Rhys Arkins <rhys@arkins.net>
Co-authored-by: Michael Kriese <michael.kriese@visualon.de>

Co-authored-by: Rhys Arkins <rhys@arkins.net>

This reverts commit 0b287c76.

The previously used command, `dotnet new nugetconfig` creates a nuget.config with some defaults that we are not interested in while creating the temporary file for authentication.

Fixes #7769

* fix(nuget): don't fail when updating lockfiles with private registries

* fix imports

* encapsulate getRandomString for better testability

* ignore wrapper for coverage