Upgrade all repos targeting net6.0 to net7.0

[MichaelSimons]

Ensure all repos have migrated from net6.0 to net7.0 These repos bring in the following prebuilts:

Microsoft.AspNetCore.App.Ref.6.0.x
Microsoft.NETCore.App.Host.linux-x64.6.0.x
Microsoft.NETCore.App.Ref.6.0.x

These package cannot be added SBRP because starting in 6.0 the app ref package contain analyzers (e.g. code) that has the potential to be loaded/run.

Repo	Requires upgrade	Patched	PR	Merged	Changes flowed in (complete)	Notes
command-line-api	✔️	✔️	dotnet/command-line-api#1803	✔️	✔️
roslyn			dotnet/roslyn#62916			Utilizing SBRP targeting pack
msbuild	✔️	✔️	dotnet/msbuild#7790	✔️	✔️	BenVillalobos is working on this.
runtime	✔️	✔️	dotnet/runtime#75168	✔️	✔️
xliff-tasks	✔️	✔️	dotnet/xliff-tasks#652	✔️	✔️
roslyn-analyzers	✔️	✔️	dotnet/roslyn-analyzers#6088	✔️	✔️
nuget-client	✔️	✔️	NuGet/NuGet.Client#4742	✔️	✔️
templating	✔️	✔️	dotnet/templating#5021	✔️	✔️
fsharp	✔️	✔️	dotnet/fsharp#13706	✔️	✔️
sdk	✔️	✔️	dotnet/sdk#27012	✔️	✔️	Check if dotnet-watch works in net6.0 projects.
vstest	✔️	✔️	microsoft/vstest#3944	✔️	✔️
source-build-reference-packages
sourcelink
arcade
diagnostics
razor-compiler
source-build-externals
symreader
xdt
linker
aspnetcore
deployment-tools
format
test-templates
installer

[MichaelSimons]

All repos have been upgraded and source-build builds clean - closing.