Fixed MRR charts displaying incorrect data at beginning of time range

[cmraible]

ref https://linear.app/ghost/issue/NY-328/investigate-mrr-chart-showing-zero-for-blueshirt-banter

TK - early draft, needs cleanup and more testing

[coderabbitai]

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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 chris-ny-328-investigate-mrr-chart-showing-zero-for-blueshirt-banter

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