Delete process-stream.ts #4030

Job	Run time
build-and-check	2m 38s
test-integration-.agents	46s
test-integration-backend	39s
test-integration-npm-app	39s
test-integration-cli	32s
test-integration-packages/agent-runtime	39s
test-integration-common	43s
test-.agents	36s
test-integration-web	38s
test-backend	39s
test-cli	37s
test-common	38s
test-packages/agent-runtime	48s
test-npm-app	50s
test-web	42s
	12m 4s

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