Remove dependency on EF Core "Issue26779" AppContext switch #1176
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EF Core v6.0.2 introduced a breaking change regarding change tracking of many-to-many relationships, which broke removing from many-to-many relationships in JsonApiDotNetCore in some cases. Fortunately, an AppContext switch to revert to the old behavior was added, which we've used since JsonApiDotNetCore v5.0.0.
The switch has been removed in EF (Core) 7. This PR fixes our code to no longer require the "Microsoft.EntityFrameworkCore.Issue26779" backward-compatibility switch. This unblocks us from upgrading to the latest preview version.
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