Make write_file completely deterministic. No edit snippet #5814

Job	Run time
build-and-check	2m 53s
test-integration-packages/internal	1m 0s
test-integration-packages/agent-runtime	41s
test-integration-packages/billing	1m 0s
test-integration-common	46s
test-integration-cli	44s
test-integration-web	45s
test-packages/internal	44s
test-common	39s
test-.agents	57s
test-web	48s
test-packages/billing	1m 0s
test-cli	51s
test-sdk	56s
test-packages/agent-runtime	39s
test-integration-sdk	42s
	15m 5s

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