Fix unit tests by updating cover block fixtures

[noahtallen]

Description

#26001 introduced a new attribute isRepreated for the cover block, but didn't include them in the fixtures files (meaning that unit tests are currently broken). This adds that attribute to the fixtures for the cover block.

How has this been tested?

Unit tests should pass in this PR

Screenshots

Types of changes

fix unit tests

Checklist:

• My code is tested.
• My code follows the WordPress code style.
• My code follows the accessibility standards.
• My code has proper inline documentation.
• I've included developer documentation if appropriate.
• I've updated all React Native files affected by any refactorings/renamings in this PR.

[jeyip]

LGTM 🚀

+1 so long as the e2e tests pass

[github-actions]

Size Change: 0 B

Total Size: 1.19 MB

ℹ️ View Unchanged

Filename	Size	Change
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build/annotations/index.js	3.52 kB	0 B
build/api-fetch/index.js	3.35 kB	0 B
build/autop/index.js	2.72 kB	0 B
build/blob/index.js	667 B	0 B
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build/block-directory/style-rtl.css	943 B	0 B
build/block-directory/style.css	942 B	0 B
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build/block-library/theme-rtl.css	741 B	0 B
build/block-library/theme.css	741 B	0 B
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build/date/index.js	31.9 kB	0 B
build/deprecated/index.js	772 B	0 B
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build/edit-navigation/style-rtl.css	868 B	0 B
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build/escape-html/index.js	734 B	0 B
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build/format-library/style-rtl.css	547 B	0 B
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build/is-shallow-equal/index.js	710 B	0 B
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build/list-reusable-blocks/style-rtl.css	476 B	0 B
build/list-reusable-blocks/style.css	476 B	0 B
build/media-utils/index.js	5.12 kB	0 B
build/notices/index.js	1.69 kB	0 B
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build/nux/style-rtl.css	671 B	0 B
build/nux/style.css	668 B	0 B
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build/url/index.js	4.06 kB	0 B
build/viewport/index.js	1.75 kB	0 B
build/warning/index.js	1.13 kB	0 B
build/wordcount/index.js	1.17 kB	0 B

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