standard-tests[minor]: Add test for streaming token counts with tools #14869

Job	Run time
Check linting	5m 52s
platform-compatibility (ubuntu-latest)	2m 25s
platform-compatibility (windows-latest)	16m 51s
platform-compatibility (macos-latest)	2m 58s
test-exports / exports-esbuild	6m 5s
test-exports / exports-cf	6m 14s
test-exports / exports-cjs	6m 47s
test-exports / exports-esm	6m 24s
test-exports / exports-vercel	7m 18s
test-exports / exports-vite	6m 4s
test-exports / exports-tsc	5m 49s
	1h 12m 47s

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