[6.0] Tools: Warn/error when using new features on old runtimes #26127
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Fixes #25153
Customer impact
Without this, users will get this lovely error if they try to run
dotnet ef dbcontext optimize
on projects using EF Core 5.0 and 3.1:Regression
No--feature is new in 6.0.
Testing
Manually verified. We don't have any automated tests mixing EF Core 5.0 projects and 6.0 tools.
Risk
Low.