[compiler:babel] Don't read config files when not running as part of

[poteto]

Stack from ghstack (oldest at bottom):

• -> #29211
• #29214
• #29213

user's pipeline

When the user app has a babel.config file that is missing the compiler, strange things happen as babel does some strange merging of options from the user's config and in various callsites like in our eslint rule and healthcheck script. To minimize odd behavior, we default to not reading the user's babel.config

Fixes #29135

[vercel[bot]]

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Name	Status	Preview	Comments	Updated (UTC)
react-compiler-playground	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 29, 2024 2:47am

[react-sizebot]

Comparing: a9a01068084550c0c71d8da222eb67eb7024c5b3...8e5d07180feb8590f210fea4bc1cf3f2b33a1786

Critical size changes

Includes critical production bundles, as well as any change greater than 2%:

Name	+/-	Base	Current	+/- gzip	Base gzip	Current gzip
oss-stable/react-dom/cjs/react-dom.production.js	=	6.66 kB	6.66 kB	=	1.82 kB	1.82 kB
oss-stable/react-dom/cjs/react-dom-client.production.js	=	496.38 kB	496.38 kB	=	88.84 kB	88.84 kB
oss-experimental/react-dom/cjs/react-dom.production.js	=	6.67 kB	6.67 kB	=	1.83 kB	1.83 kB
oss-experimental/react-dom/cjs/react-dom-client.production.js	=	501.20 kB	501.20 kB	=	89.53 kB	89.53 kB
facebook-www/ReactDOM-prod.classic.js	=	593.81 kB	593.81 kB	=	104.45 kB	104.45 kB
facebook-www/ReactDOM-prod.modern.js	=	570.20 kB	570.20 kB	=	100.85 kB	100.85 kB
test_utils/ReactAllWarnings.js	Deleted	63.65 kB	0.00 kB	Deleted	15.90 kB	0.00 kB

Significant size changes

Includes any change greater than 0.2%:

Expand to show

Name	+/-	Base	Current	+/- gzip	Base gzip	Current gzip
test_utils/ReactAllWarnings.js	Deleted	63.65 kB	0.00 kB	Deleted	15.90 kB	0.00 kB

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