cli: save credentials while preserving other fields #5441

Job	Run time
build-and-check	2m 29s
test-integration-packages/billing	42s
test-integration-sdk	46s
test-packages/internal	44s
test-web	47s
test-integration-.agents	40s
test-integration-common	40s
test-integration-web	38s
test-packages/billing	43s
test-sdk	42s
test-integration-packages/internal	38s
test-common	38s
test-integration-packages/agent-runtime	46s
test-integration-cli	40s
test-.agents	36s
test-packages/agent-runtime	55s
test-cli	1m 21s
	14m 25s

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