[6.0][PackageGraph] Allow package-level cyclic dependency only for >= 6.0 … #7617
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…manifests
Follow-up to #7530
Otherwise it might be surprising for package authors to discover that their packages cannot be used with older tools because they inadvertently introduced a cyclic dependency in a new version.
Scope: dependency resolution.
Main Branch PR: [PackageGraph] Allow package-level cyclic dependency only for >= 6.0 … #7579
Resolves: rdar://126217172
Risk: Low
Reviewed By: @bnbarham
Testing: New tests added to the test suite.
(cherry picked from commit 3098b2d)