When running jest script through npm, the snapshot summary help message is missing `--`

[yjcxy12]

Do you want to request a feature or report a bug?
Report a bug

What is the current behavior?
When running jest through npm script, the Snapshot Summary report outputs wrong help message. e.g. run `npm run test:react -u` to remove it. rather than run `npm run test:react -- -u` to remove it.

If the current behavior is a bug, please provide the steps to reproduce and
either a repl.it demo through https://repl.it/languages/jest or a minimal
repository on GitHub that we can yarn install and yarn test.

• make a snapshot
• run test
• remove original component
• run test again

What is the expected behavior?
It should output run `npm run test:react -- -u

Please provide your exact Jest configuration and mention your Jest, node,
yarn/npm version and operating system.
Using npm@5 node@8 Macbook OSX

Additional info
Suspect https://github.com/facebook/jest/blob/master/packages/jest-cli/src/reporters/summary_reporter.js#L147 is the line to fix. Only checking isYarn.

[rickhanlonii]

Nice find @yjcxy12

This is probably a dupe of #2517

[SimenB]

Should have been fixed in #5376.

[github-actions]

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