Add credentialless as a recognized boolean attribute for iframes (#36… #1724

Job	Run time
Discover yarn workspaces	6s
Lint babel-plugin-react-compiler	29s
Jest babel-plugin-react-compiler	50s
Test make-read-only-util	27s
Test react-compiler-healthcheck	23s
Test react-compiler-runtime	22s
Test babel-plugin-react-compiler	57s
Test snap	20s
Test react-forgive	44s
Test eslint-plugin-react-compiler	38s
Test react-mcp-server	22s
	5m 38s

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