Refactor package references

[martincostello]

Cherry-pick changes from #876.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 44.72%. Comparing base (20499b9) to head (35eb4cd).
Report is 1 commits behind head on main.

✅ All tests successful. No failed tests found.

Additional details and impacted files

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##             main     #968   +/-   ##
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  Coverage   44.72%   44.72%           
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  Files          21       21           
  Lines         322      322           
  Branches       49       49           
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  Hits          144      144           
  Misses        162      162           
  Partials       16       16           

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linux	44.72% <ø> (ø)
macos	44.72% <ø> (ø)
windows	44.72% <ø> (ø)

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[Copilot]

Pull Request Overview

Refactors package management by cherry-picking changes from #876 to surface version overrides directly in the Automate project and cleaning up central definitions.

• Explicitly target netstandard2.0 in the Automate csproj and add a VersionOverride for System.Text.Json
• Remove System.Net.Http.Json and System.Text.Json from Directory.Packages.props to centralize overrides in individual projects

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/MartinCostello.BrowserStack.Automate/MartinCostello.BrowserStack.Automate.csproj	Adjusted ItemGroup conditions and added VersionOverride for System.Text.Json in the netstandard2.0 group
Directory.Packages.props	Removed central PackageVersion entries for System.Net.Http.Json and System.Text.Json

Comments suppressed due to low confidence (2)

src/MartinCostello.BrowserStack.Automate/MartinCostello.BrowserStack.Automate.csproj:19

• After removing central versions for System.Text.Json and System.Net.Http.Json, this net8.0 ItemGroup is missing explicit references for those packages. Add <PackageReference Include="System.Text.Json" VersionOverride="[8.0.5,)" /> and <PackageReference Include="System.Net.Http.Json" VersionOverride="[8.0.0,)" /> to avoid build errors.

<ItemGroup Condition="$([MSBuild]::IsTargetFrameworkCompatible('$(TargetFramework)', 'net8.0'))">

src/MartinCostello.BrowserStack.Automate/MartinCostello.BrowserStack.Automate.csproj:14

• [nitpick] Using an explicit equality check limits future TFM variants. If the intent is to include all frameworks incompatible with net8.0, consider reverting to the MSBuild compatibility function or expanding the condition accordingly.

<ItemGroup Condition=" '$(TargetFramework)' == 'netstandard2.0' ">