core[minor]: Make LLMs and chat models always stream when invoked within streamEvents #13281

Job	Run time
Check linting	2m 18s
test-exports / exports-esbuild	2m 39s
test-exports / exports-esm	2m 32s
test-exports / exports-vercel	3m 25s
test-exports / exports-cjs	2m 18s
test-exports / exports-tsc	2m 23s
test-exports / exports-cf	2m 18s
test-exports / exports-vite	2m 37s
	20m 30s

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