[MWPW-169165] Added Authorable Labels to Grid Marquee

[JingleH]

• Allow authors to use italics to add labels to grid-marquee cards.
• Slight refactoring

Resolves: https://jira.corp.adobe.com/browse/MWPW-169165

Test URLs:

• Before: https://stage--express-milo--adobecom.aem.live/drafts/jingle/?martech=off
• After: https://grid-marquee-labels--express-milo--adobecom.aem.live/drafts/jingle/?martech=off

How to test:

• Hover over the third card "Create fast with...", and you should see the labels being added.
• All other features of this block should remain the same

[aem-code-sync]

Hello, I'm the AEM Code Sync Bot and I will run some actions to deploy your branch and validate page speed.
In case there are problems, just click a checkbox below to rerun the respective action.

• Re-run PSI checks
• Re-sync branch

Commits

• a8cddbd ✅ (latest)

[aem-code-sync]

	Page	Scores	Audits
📱	/drafts/jingle/?martech=off
🖥️	/drafts/jingle/?martech=off

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.51%. Comparing base (1d7887e) to head (a8cddbd).
Report is 42 commits behind head on stage.

Additional details and impacted files

@@            Coverage Diff             @@
##            stage     #246      +/-   ##
==========================================
+ Coverage   67.12%   67.51%   +0.39%     
==========================================
  Files          63       61       -2     
  Lines       10353    10148     -205     
==========================================
- Hits         6949     6851      -98     
+ Misses       3404     3297     -107     

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