MWPW-175016 [OST] add strikethrough template for promotion price

[bozojovicic]

Resolves https://jira.corp.adobe.com/browse/MWPW-175016
QA Checklist: https://wiki.corp.adobe.com/display/adobedotcom/M@S+Engineering+QA+Use+Cases

Tacocat PR https://git.corp.adobe.com/wcms/tacocat.js/pull/676

New template 'Promotion Strikethrough Price' added for PROMOTION offers

Test pages :
Milo OST https://mwpw175016promost--milo--bozojovicic.aem.page/tools/ost?maslibs=MWPW-175016&token=<>
MAS Studio OST https://mwpw-175016--mas--adobecom.aem.live/studio.html#page=content&path=sandbox
Milo page with ST promo price https://mwpw175016promost--milo--bozojovicic.aem.page/drafts/bozo/st-promo?maslibs=MWPW-175016

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-175016--mas--adobecom.aem.live/

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Commits

• 0c47878 ✅ (latest)
• eea4ff4 ✅
• 273158a ✅
• 23051ed ✅
• b604611 ✅
• 20941a1 ✅
• 2d73f1e ✅
• f41c534 ✅

[honstar]

LGTM