test(sops): make registerSOPSSource idempotent in e2e tests

[skevetter]

Makes registerSOPSSource idempotent in e2e/tests/up/sops.go by attempting to remove any existing secret source prior to adding a new one, ensuring clean test state setup across test retries and sequential runs.

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PR created automatically by Jules for task 6671626066254004490 started by @skevetter

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