core[patch]: Allow runnable tools to take single string/`ToolCall` inputs #14547

Job	Run time
Check linting	3m 42s
test-exports / exports-esbuild	3m 40s
test-exports / exports-cf	3m 39s
test-exports / exports-cjs	3m 40s
test-exports / exports-esm	3m 40s
test-exports / exports-vercel	3m 41s
test-exports / exports-tsc	3m 41s
test-exports / exports-vite	3m 38s
	29m 21s

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