fix(sass): notification refactor inline toast

[andreancardona]

Closes #8905

• Refactors Notification: inline-notification & toast-notification to SASS modules

Testing:

• run yarn test --watch packages/styles/scss/components/__tests__/inline-notification-test.js
• run yarn test --watch packages/styles/scss/components/__tests__/toast-notification-test.js
• Make sure tests pass
• cd packages/carbon-react run yarn storybook to make sure none of the styles are broken for notification

[andreancardona]

@joshblack

was talking to @tw15egan and it seems some of the styles within the feature flag are broken - should we leave that as is for now since that won't be an issue for the v11 release?

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[tw15egan]

Few small tweaks but otherwise looking good

[andreancardona]

Few small tweaks but otherwise looking good

Ready for your review again - removed knobs and stripped out a lot of the unneeded props. :)

[tw15egan]

LGTM 👍 ✅