Fix #1065: type conversion for subtree string remapping

[facontidavide]

Summary

• Fix std::runtime_error when passing typed data (e.g. std::deque) through SubTree ports via string literals
• Upgrade weakly-typed blackboard entries when a strongly-typed port connects

Test plan

• New test: PortTest.SubtreeStringRemapping_Issue1065
• All existing tests pass (298/298)

Closes #1065

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix/issue-1065

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