fix(helm): support secrets.existingSecret for core secrets #4040

Job	Run time
e2e / 🧪 CLI v3 tests (ubuntu-latest - pnpm)	1m 50s
e2e / 🧪 CLI v3 tests (windows-latest - npm)	3m 54s
typecheck / typecheck	6m 8s
e2e / 🧪 CLI v3 tests (ubuntu-latest - npm)	1m 46s
units / packages / 🧪 Unit Tests: Packages (1, 1)	8m 25s
e2e / 🧪 CLI v3 tests (windows-latest - pnpm)	3m 46s
units / webapp / 🧪 Unit Tests: Webapp (1, 8)	6m 0s
units / webapp / 🧪 Unit Tests: Webapp (5, 8)	7m 10s
units / internal / 🧪 Unit Tests: Internal (4, 8)	5m 11s
units / webapp / 🧪 Unit Tests: Webapp (6, 8)	3m 1s
units / internal / 🧪 Unit Tests: Internal (7, 8)	5m 8s
units / internal / 🧪 Unit Tests: Internal (2, 8)	9m 31s
units / internal / 🧪 Unit Tests: Internal (8, 8)	2m 59s
units / webapp / 🧪 Unit Tests: Webapp (2, 8)	4m 13s
units / webapp / 🧪 Unit Tests: Webapp (8, 8)	2m 35s
units / internal / 🧪 Unit Tests: Internal (5, 8)	3m 44s
units / internal / 🧪 Unit Tests: Internal (1, 8)	5m 52s
units / internal / 🧪 Unit Tests: Internal (6, 8)	4m 13s
units / webapp / 🧪 Unit Tests: Webapp (3, 8)	6m 30s
units / webapp / 🧪 Unit Tests: Webapp (4, 8)	4m 3s
units / webapp / 🧪 Unit Tests: Webapp (7, 8)	5m 39s
units / internal / 🧪 Unit Tests: Internal (3, 8)	6m 2s
units / webapp / 📊 Merge Reports	48s
units / packages / 📊 Merge Reports	22s
units / internal / 📊 Merge Reports	21s
	1h 49m 11s

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