Improve output for yarn integrity check

What does this MR do?

Improve output if yarn detects missing dependencies.

Screenshots

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After

$ yarn jest spec/frontend/monitoring/components/dashboard_spec.js yarn run v1.16.0 $ yarn check-dependencies $ yarn check --integrity warning Integrity check: Top level patterns don't match error Integrity check failed error Found 1 errors. info Visit https://yarnpkg.com/en/docs/cli/check for documentation about this command. error Command failed with exit code 1. info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command. error Command failed with exit code 1. info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.

$ yarn jest spec/frontend/monitoring/components/dashboard_spec.js yarn run v1.16.0 $ yarn check-dependencies $ scripts/frontend/check_dependencies.sh yarn check --integrity failed! You are probably missing some dependencies. Please run yarn install and try again. error Command failed with exit code 1. info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command. error Command failed with exit code 1. info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.

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