feat: Add ExcludeFromMultiTenantResolution() and ExcludeFromMultiTenantResolutionAttribute for endpoints.

[wxwyz]

Usage:

app.MapOpenApi()
    .ExcludeFromMultiTenantResolution();

[wxwyz]

Darn, my second commit automatically added itself to the PR.

[wxwyz]

@dotnet-policy-service agree

[AndrewTriesToCode]

thanks!

[wxwyz]

I went back and forth on going with BypassMultiTenantResolution as opposed to ExcludeFrom. I chose ExcludeFrom because of an existing process, but I'm more keen on Bypass. Thought I'd throw that out there, incase it's a discussion.