MWPW-160879 Add hero-marquee in loadLCPImage

[TsayAdobe]

• The old code only checks marquee block. Some pages may use hero-marquee.
• The image in a hero marquee should have the loading eager attribute.

Resolves: MWPW-160879

Test URLs
Before : http://main--dc--adobecom.hlx.live/acrobat/features/modify-pdfs
After : http://MWPW-160879--dc--adobecom.hlx.live/acrobat/features/modify-pdfs

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Commits

• c5bd414 ✅ (latest)
• 2fa336b ✅

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.74%. Comparing base (e906a48) to head (c5bd414).
Report is 3 commits behind head on stage.

Additional details and impacted files

@@            Coverage Diff             @@
##            stage     #884      +/-   ##
==========================================
- Coverage   84.75%   84.74%   -0.02%     
==========================================
  Files          48       48              
  Lines        6147     6148       +1     
==========================================
  Hits         5210     5210              
- Misses        937      938       +1     

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