MWPW-185112: Add unit text getter

[yesil]

e.g., "per license".

Resolves https://jira.corp.adobe.com/browse/MWPW-185112
QA Checklist: https://wiki.corp.adobe.com/display/adobedotcom/M@S+Engineering+QA+Use+Cases

Please do the steps below before submitting your PR for a code review or QA

• C1. Cover code with Unit Tests
• C2. Add a Nala test (double check with #fishbags if nala test is needed)
• C3. Verify all Checks are green (unit tests, nala tests)
• C4. PR description contains working Test Page link where the feature can be tested
• C5: you are ready to do a demo from Test Page in PR (bonus: write a working demo script that you'll use on Thursday, you can eventually put in your PR)
• C.6 read your Jira one more time to validate that you've addressed all AC's and nothing is missing

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Test URLs:

• Before: https://main--mas--adobecom.aem.live/
• After: https://mwpw-185112--mas--adobecom.aem.live/

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Commits

• 6cad47a ✅ (latest)
• bd4d271 ✅
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• 8414d7c ✅

[yesil]

this file should never be updated with my change, the following imports need to be removed from merch-card-collection.js

import { getFragmentMapping } from './variants/variants.js';
import { normalizeVariant } from './hydrate.js';

[honstar]

Will you be addressing this change?