Reference analyzer and fixer to avoid race conditions when packing

[andreasohlund]

Without this, the release might fail with

Error: /usr/share/dotnet/sdk/10.0.300/NuGet.Build.Tasks.Pack.targets(222,5): error NU5019: File not found: '/home/runner/work/NServiceBus.AzureFunctions/NServiceBus.AzureFunctions/src/NServiceBus.AzureFunctions.Analyzer/bin/Release/netstandard2.0/NServiceBus.AzureFunctions.Analyzer.dll'. [/home/runner/work/NServiceBus.AzureFunctions/NServiceBus.AzureFunctions/src/NServiceBus.AzureFunctions.Common/NServiceBus.AzureFunctions.Common.csproj]

This forces the fixer and analyzer to be build before we try to pack them

https://github.com/Particular/NServiceBus.AzureFunctions/actions/runs/26930357041