perf fix: calculateNextScheduledTimestamp speed improvement #2813

Job	Run time
e2e / 🧪 CLI v3 tests (ubuntu-latest - npm)	2m 16s
typecheck / typecheck	4m 50s
e2e / 🧪 CLI v3 tests (ubuntu-latest - pnpm)	2m 11s
e2e / 🧪 CLI v3 tests (windows-latest - npm)	5m 40s
e2e / 🧪 CLI v3 tests (windows-latest - pnpm)	5m 32s
units / internal / 🧪 Unit Tests: Internal (1, 8)	3m 33s
units / internal / 🧪 Unit Tests: Internal (2, 8)	3m 51s
units / internal / 🧪 Unit Tests: Internal (3, 8)	3m 16s
units / internal / 🧪 Unit Tests: Internal (4, 8)	3m 24s
units / internal / 🧪 Unit Tests: Internal (5, 8)	3m 37s
units / internal / 🧪 Unit Tests: Internal (6, 8)	7m 15s
units / internal / 🧪 Unit Tests: Internal (7, 8)	2m 55s
units / packages / 🧪 Unit Tests: Packages (1, 1)	3m 7s
units / internal / 🧪 Unit Tests: Internal (8, 8)	1m 44s
units / webapp / 🧪 Unit Tests: Webapp (1, 10)	2m 2s
units / webapp / 🧪 Unit Tests: Webapp (2, 10)	2m 11s
units / webapp / 🧪 Unit Tests: Webapp (3, 10)	2m 40s
units / webapp / 🧪 Unit Tests: Webapp (4, 10)	5m 27s
units / webapp / 🧪 Unit Tests: Webapp (5, 10)	5m 44s
units / webapp / 🧪 Unit Tests: Webapp (6, 10)	2m 3s
units / webapp / 🧪 Unit Tests: Webapp (7, 10)	2m 7s
units / webapp / 🧪 Unit Tests: Webapp (8, 10)	2m 1s
units / webapp / 🧪 Unit Tests: Webapp (9, 10)	1m 59s
units / webapp / 🧪 Unit Tests: Webapp (10, 10)	1m 59s
units / packages / 📊 Merge Reports	17s
units / webapp / 📊 Merge Reports	19s
units / internal / 📊 Merge Reports	23s
	1h 22m 23s

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