feat(cli): implement upgrade check (Sprint 2) - #1196

'string.IndexOf(char)' has a method overload that takes a 'StringComparison' parameter. Replace this call in 'FSH.CLI.Services.VersionComparer.ParseVersionParts(string)' with a call to 'string.IndexOf(char, System.StringComparison)' for clarity of intent. (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1307)

Avoid creating a new 'JsonSerializerOptions' instance for every serialization operation. Cache and reuse instances instead. (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1869)

Do not use Enumerable methods on indexable collections. Instead use the collection directly. (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1826)

Remove this unused method parameter 'package'. (https://rules.sonarsource.com/csharp/RSPEC-1172)

Merge this if statement with the enclosing one. (https://rules.sonarsource.com/csharp/RSPEC-1066)

Remove this unused method parameter 'cancellationToken'. (https://rules.sonarsource.com/csharp/RSPEC-1172)

Remove this unused method parameter 'manifest'. (https://rules.sonarsource.com/csharp/RSPEC-1172)

Modify 'ParsePackagesProps' to catch a more specific allowed exception type, or rethrow the exception (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1031)

Modify 'TryLoad' to catch a more specific allowed exception type, or rethrow the exception (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1031)