downloading binary: if unlinking previous binary fails, try renaming it #4469

Job	Run time
build-and-check	3m 6s
test-npm-app	55s
test-.agents	1m 2s
test-common	57s
test-packages/internal	57s
test-backend	1m 4s
test-packages/agent-runtime	1m 5s
test-packages/billing	53s
test-cli	1m 14s
test-integration-.agents	56s
test-sdk	1m 7s
test-web	1m 7s
test-integration-npm-app	56s
test-integration-packages/internal	56s
test-integration-backend	1m 1s
test-integration-packages/billing	1m 4s
test-integration-web	58s
test-integration-sdk	1m 18s
test-integration-packages/agent-runtime	58s
test-integration-cli	52s
test-integration-common	57s
	23m 23s

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