Update to .NET 6 Preview 7

[bricelam]

Resolves #25148

[bricelam]

Ugg. More OData failures.

[bricelam]

@ajcvickers Looks like there are binary breaking changes in Logging: 😕

MissingMethodException : Method not found: 'Microsoft.Extensions.Logging.LoggerMessage.Define(LogLevel, EventId, string, bool)'.

Additional changes made to skip OData tests

[dougbu]

Looks like there are binary breaking changes in Logging: 😕

This is a known issue though the breadth of the change is pretty annoying. Fix is

private static readonly LogDefineOptions SkipEnabledCheckLogOptions = new() { SkipEnabledCheck = true };`
...
_generatedCodeToAssemblyCompilationEnd = LoggerMessage.Define<string, double>(
    LogLevel.Annoyance,
    2,
    "...",
    SkipEnabledCheckLogOptions);

See also @TanayParikh's work in dotnet/aspnetcore#34033 and the actual break in dotnet/runtime#54581.

[bricelam]

So, the problem with that approach is that we don't own the code with skipEnabledCheck: true. It's inside the OData package. Will skip until OData releases a new package that's compatible (or the binary breaking change is reverted).

[AndriySvyryd]

Upgrading to Preview 7 resolves this, but brings other breaking changes, see #25324

[bricelam]

Yuck. Our branches are getting messy with one-offs in preview 6 and preview 7. ☹️ Do we have a clear path forward? Should we snub contributors and start using preview 7 (or rc 1) builds of the SDK in main?

[AndriySvyryd]

Should we snub contributors and start using preview 7 (or rc 1) builds of the SDK in main?

We should wait until dotnet/roslyn#55114 is fixed and then jump to rc1. If it's not fixed in rc1, then we'll need to have a discussion.

[bricelam]

@AndriySvyryd It looks like the latest daily build of the Preview 7 SDK has it. (Or at least my local build seems to have passed.) Can you review to make sure I didn't keep anything from #25324 that we don't want in main?