fix(RatingsBar): Conditional box shadow (hide if 0%)

[awgraves]

Overview

Conditional box shadow (hide if 0%)

PR Checklist

• Related to designs:
• Related to JIRA ticket: REACH-2324
• I have run this code to verify it works
• This PR includes unit tests for the code change
• This PR includes testing instructions tests for the code change
• The alpha package of this PR is passing end-to-end tests in all relevant Codecademy repositories

Testing Instructions

1. Go to local gamut and yarn start.

2. Visit http://localhost:6006/?path=/docs/brand-labs-atoms-ratingsbar--ratings-barr

3. Confirm the bar still has box shadow if percent is greater than zero
   

4. Set the minimumPercent and percent to zero. Confirm you see an empty bar (without a boxshadow line to the right of the beginning edge)
   

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✅ Successfully ran 3 targets

• nx run-many --target=verify --parallel=3 --all
• nx run-many --target=build --all
• nx run-many --target=build --all

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All committers have signed the CLA.

[bndiep]

tested locally. lgtm!