This PR implements the default behaviour for promotion callout. It relies on Alex's display-price work in her PR #1760 .

If the rendered price is a promotional price, we'll also render that promo's callout message in the ProductTile. Otherwise, if the variant has promotions, we'll show the callout from the very first promotion.

Types of Changes

[ ] Bug fix (non-breaking change that fixes an issue)
[ ] New feature (non-breaking change that adds functionality)
[ ] Documentation update
[ ] Breaking change (could cause existing functionality to not work as expected)
[ ] Other changes (non-breaking changes that does not fit any of the above)

Breaking changes include:

Removing a public function or component or prop

Adding a required argument to a function

Changing the data type of a function parameter or return value

Adding a new peer dependency to package.json

Changes

(change1)

How to Test-Drive This PR

Navigate to this PLP: /search?q=roll%20sleeve%20blouse
Verify the promo callout message to be "10$ Off roll sleeve blouse". 34.16 is a promotional price, and we're rendering the callout message of that promotion.

Also, try other kinds of products:

without promotions
no variants (for the first 3 results)
product set

Also, try other pages:

homepage
PDP (and its recommended products)

Checklists

General

[x] Changes are covered by test cases
[ ] CHANGELOG.md updated with a short description of changes (not required for documentation updates)

Accessibility Compliance

You must check off all items in one of the follow two lists:

[ ] There are no changes to UI

or...

[ ] Changes were tested with a Screen Reader (iOS VoiceOver or Android Talkback) and had no issues
[ ] Changes comply with WCAG 2.0 guidelines levels A and AA
[ ] Changes to common UI patterns and interactions comply with WAI-ARIA best practices

Localization

[ ] Changes include a UI text update in the Retail React App (which requires translation)

SalesforceCommerceCloud / pwa-kit

[Product Tile] Promotion callout message (@W-13974753@) #1786