housekeeping: Fix CodeCov Paths

[worldbeater]

What kind of change does this PR introduce?

This PR updates the ci-build.yml file with the new parameters coming from reactiveui/ReactiveUI.Validation#156 With this PR, we are getting rid of node, dotnet-reportgenerator and npm, we are invoking codecov bash script now. This PR also updates the codecov paths from the old format a/ReactiveUI/ReactiveUI/src/ReactiveUI/VariadicTemplates.cs to the new format src/ReactiveUI/VariadicTemplates.cs, this should fix potential issues with paths.

[codecov]

Codecov Report

Merging #2566 into main will increase coverage by 5.71%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #2566      +/-   ##
==========================================
+ Coverage   57.94%   63.66%   +5.71%     
==========================================
  Files         127      129       +2     
  Lines        4580     4612      +32     
  Branches      684        0     -684     
==========================================
+ Hits         2654     2936     +282     
- Misses       1664     1676      +12     
+ Partials      262        0     -262     

Impacted Files	Coverage Δ
...eactiveUI/Platforms/windows-common/ReactivePage.cs
...ReactiveUI/src/ReactiveUI/Mixins/ChangeSetMixin.cs
...I/ReactiveUI/src/ReactiveUI/Mixins/CompatMixins.cs
...tiveUI/src/ReactiveUI.XamForms/ReactiveTextCell.cs
...iveUI/src/ReactiveUI.XamForms/AutoSuspendHelper.cs
...c/ReactiveUI/Bindings/Converter/StringConverter.cs
...iveUI/src/ReactiveUI.XamForms/ViewModelViewHost.cs
...veUI/src/ReactiveUI.XamForms/ReactiveSwitchCell.cs
...ReactiveUI/Comparers/ComparerChainingExtensions.cs
...I/src/ReactiveUI/Routing/RoutableViewModelMixin.cs
... and 246 more

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[github-actions]

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