Added --ignore-scripts flag to integrity check

[bestander]

Summary

--ignore-scripts affects the underlying node_modules and should be factored in integrity check

Test plan

• added test
• manual

bestander-mbp:left-pad bestander$ yarn install --ignore-scripts
yarn install v0.24.0-0
warning No license field
[1/4] 🔍  Resolving packages...
warning Integrity check: Flags don't match
[2/4] 🚚  Fetching packages...
[3/4] 🔗  Linking dependencies...
[4/4] 📃  Building fresh packages...
warning Ignored scripts due to flag.
✨  Done in 0.55s.

bestander-mbp:left-pad bestander$ yarn check --integrity
yarn check v0.24.0-0
warning No license field
warning Integrity check: Flags 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.

bestander-mbp:left-pad bestander$ yarn check --integrity --ignore-scripts
yarn check v0.24.0-0
warning No license field
success Folder in sync.
✨  Done in 0.06s.