MWPW-204749-0: Consolidate injectJsonLd cardTitle handling for long-text field shapes

[Andrei4226]

Resolves https://jira.corp.adobe.com/browse/MWPW-204749
QA Checklist: https://wiki.corp.adobe.com/display/adobedotcom/M@S+Engineering+QA+Use+Cases

Defensive consolidation for injectJsonLd: cardTitle is becoming a long-text (RTE) field, same as description. Unwraps cardTitle the same way description already is before using it as JSON-LD name, in case it's ever passed as {mimeType, value}.

Verified in Milo (merch-card-autoblock.js, the only caller of injectJsonLd): fields is already normalized to plain strings before reaching this function, so cardTitle will keep working exactly as today. This change is optional/non-blocking , just included for consolidation, not because it's required for the field-type change to be safe.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.78%. Comparing base (6729934) to head (ac18f94).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1211      +/-   ##
==========================================
+ Coverage   90.76%   90.78%   +0.02%     
==========================================
  Files         318      318              
  Lines      101699   101701       +2     
==========================================
+ Hits        92304    92327      +23     
+ Misses       9395     9374      -21     

Files with missing lines	Coverage Δ
web-components/src/json-ld.js	100.00% <100.00%> (ø)

... and 12 files with indirect coverage changes

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[yesil]

@Andrei4226 please resolve the conflict