[DevTools] Avoid uncached Promise when symbolicating sources in envir… #1330

Job	Run time
Discover yarn workspaces	5s
Lint babel-plugin-react-compiler	33s
Jest babel-plugin-react-compiler	54s
Test snap	18s
Test react-forgive	33s
Test make-read-only-util	31s
Test eslint-plugin-react-compiler	30s
Test react-compiler-healthcheck	22s
Test babel-plugin-react-compiler	59s
Test react-mcp-server	20s
Test react-compiler-runtime	19s
	5m 24s

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