Enable `CA1852`/`CA1812` Analyzers

[elachlan]

Is your feature request related to a problem? Please describe

• CA1852 Analyzer for sealing non-public classes which are not inherited from for performance reasons https://devblogs.microsoft.com/dotnet/performance_improvements_in_net_7/#analyzers
• CA1812 Avoid uninstantiated internal classes for performance https://learn.microsoft.com/en-au/dotnet/fundamentals/code-analysis/quality-rules/ca1812

The configs are stored here: https://github.com/dotnet/winforms/blob/main/eng/CodeAnalysis.src.globalconfig.

Describe the solution you'd like and alternatives you've considered

N/A

Will this feature affect UI controls?

N/A

This issue is now marked as "help wanted", and we’re looking for a community volunteer to work on this issue. If we receive no interest in 180 days, we will close the issue. To learn more about how we handle feature requests, please see our documentation.

Happy Coding!