Yarn replace-fork should not silently error

[bvaughn]

If the Yarn replace-fork script fails while running the lint sub-command, catch and report the error. (Previously this error was being swallowed and causing CI to incorrectly report a different problem.)

Relates to #21998, #22151

[sizebot]

Comparing: fc3b6a4...5e1b71f

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.min.js	=	127.58 kB	127.58 kB	=	40.72 kB	40.72 kB
oss-experimental/react-dom/cjs/react-dom.production.min.js	=	130.40 kB	130.40 kB	=	41.65 kB	41.65 kB
facebook-www/ReactDOM-prod.classic.js	=	405.16 kB	405.16 kB	=	75.04 kB	75.04 kB
facebook-www/ReactDOM-prod.modern.js	=	393.72 kB	393.72 kB	=	73.32 kB	73.32 kB
facebook-www/ReactDOMForked-prod.classic.js	=	405.16 kB	405.16 kB	=	75.04 kB	75.04 kB

Significant size changes

Includes any change greater than 0.2%:

(No significant changes)

Generated by 🚫 dangerJS against 5e1b71f

[ryota-murakami]

Nice fix!
In the case shouldn't reach last warn message.

"Reconciler forks are not the same! Run yarn replace-fork. Or, if this was intentional, disable this CI check."

[ryota-murakami]

https://git-scm.com/docs/git-diff#Documentation/git-diff.txt---quiet

--exit-code
Make the program exit with codes similar to diff(1). That is, it exits with 1 if there were differences and 0 means no differences.

--quiet
Disable all output of the program. Implies --exit-code.

I see, git diff --quiet option also enabling --exit-code.
there is diff = 1, no diff = 0