fix(theme-classic): do not add microdata item prop to trailing breadcrumb

[Josh-Cena]

Motivation

Fix #7135

cc @kotryna-k

Have you read the Contributing Guidelines on pull requests?

Yes

Test Plan

Tested on Rich Results.

Last item no longer has id.

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[github-actions]

⚡️ Lighthouse report for the changes in this PR:

Category	Score
🟠 Performance	63
🟢 Accessibility	100
🟢 Best practices	92
🟢 SEO	100
🟢 PWA	90

Lighthouse ran on https://deploy-preview-7179--docusaurus-2.netlify.app/

[github-actions]

Size Change: 0 B

Total Size: 799 kB

ℹ️ View Unchanged

Filename	Size
website/.docusaurus/globalData.json	50 kB
website/build/assets/css/styles.********.css	106 kB
website/build/assets/js/main.********.js	604 kB
website/build/index.html	38.8 kB

_{compressed-size-action}

[sh0umik]

@Josh-Cena thank you very much for solving this. This is causing massive warnings in my google search console on almost all the pages. need this merged badly in the upcoming release.

[Josh-Cena]

@sh0umik Really? I've tested both configs in the rich results console; neither warned me anything. Where should I test this?