[6.2][ModuleGraph] Bring back original check for implicit system libraries #8825
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Cherry-pick of #8824
Explanation:
The original check was about system libraries only, the new one filters all of the implicit modules (including snippets) which is incorrect. The is a follow-up to [6.2] Fixes a few issues with
swift package {migrate, add-setting}
commands #8812Main Branch PR: [ModuleGraph] Bring back original check for implicit system libraries #8824
Risk: Low
Reviewed By: @bnbarham
Testing: No testing was added, speculative fix.
(cherry picked from commit 68d07f2)