perf fix: calculateNextScheduledTimestamp speed improvement #2814

Job	Run time
typecheck / typecheck	5m 2s
e2e / 🧪 CLI v3 tests (ubuntu-latest - npm)	2m 15s
e2e / 🧪 CLI v3 tests (ubuntu-latest - pnpm)	2m 12s
e2e / 🧪 CLI v3 tests (windows-latest - npm)	5m 18s
e2e / 🧪 CLI v3 tests (windows-latest - pnpm)	5m 26s
units / internal / 🧪 Unit Tests: Internal (1, 8)	3m 29s
units / internal / 🧪 Unit Tests: Internal (2, 8)	3m 49s
units / internal / 🧪 Unit Tests: Internal (3, 8)	3m 14s
units / packages / 🧪 Unit Tests: Packages (1, 1)	3m 9s
units / internal / 🧪 Unit Tests: Internal (4, 8)	3m 11s
units / internal / 🧪 Unit Tests: Internal (5, 8)	3m 33s
units / internal / 🧪 Unit Tests: Internal (6, 8)	4m 8s
units / webapp / 🧪 Unit Tests: Webapp (1, 10)	2m 6s
units / internal / 🧪 Unit Tests: Internal (7, 8)	2m 53s
units / webapp / 🧪 Unit Tests: Webapp (2, 10)	2m 4s
units / internal / 🧪 Unit Tests: Internal (8, 8)	1m 48s
units / webapp / 🧪 Unit Tests: Webapp (3, 10)	2m 34s
units / webapp / 🧪 Unit Tests: Webapp (4, 10)	5m 35s
units / webapp / 🧪 Unit Tests: Webapp (5, 10)	5m 49s
units / webapp / 🧪 Unit Tests: Webapp (6, 10)	2m 8s
units / webapp / 🧪 Unit Tests: Webapp (7, 10)	2m 2s
units / webapp / 🧪 Unit Tests: Webapp (8, 10)	1m 59s
units / webapp / 🧪 Unit Tests: Webapp (9, 10)	2m 16s
units / webapp / 🧪 Unit Tests: Webapp (10, 10)	2m 2s
units / packages / 📊 Merge Reports	17s
units / internal / 📊 Merge Reports	21s
units / webapp / 📊 Merge Reports	19s
	1h 18m 59s

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