Make the adding patterns test stable

[youknowriad]

This e2e test has been failing from time to time. I got the error locally but not consistently and with this small refactor, I'm not seeing the error anymore.

[github-actions]

Size Change: 0 B

Total Size: 1.2 MB

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Filename	Size	Change
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build/annotations/index.js	3.54 kB	0 B
build/api-fetch/index.js	3.35 kB	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/data-controls/index.js	684 B	0 B
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build/deprecated/index.js	772 B	0 B
build/dom-ready/index.js	569 B	0 B
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build/edit-navigation/style-rtl.css	881 B	0 B
build/edit-navigation/style.css	885 B	0 B
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build/escape-html/index.js	733 B	0 B
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build/format-library/style-rtl.css	547 B	0 B
build/format-library/style.css	548 B	0 B
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build/html-entities/index.js	622 B	0 B
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build/is-shallow-equal/index.js	709 B	0 B
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build/keycodes/index.js	1.85 kB	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
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build/nux/style-rtl.css	671 B	0 B
build/nux/style.css	668 B	0 B
build/plugins/index.js	2.45 kB	0 B
build/primitives/index.js	1.35 kB	0 B
build/priority-queue/index.js	789 B	0 B
build/redux-routine/index.js	2.85 kB	0 B
build/reusable-blocks/index.js	3.06 kB	0 B
build/rich-text/index.js	13 kB	0 B
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build/shortcode/index.js	1.7 kB	0 B
build/token-list/index.js	1.24 kB	0 B
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build/viewport/index.js	1.75 kB	0 B
build/warning/index.js	1.13 kB	0 B
build/wordcount/index.js	1.23 kB	0 B

_{compressed-size-action}

[talldan]

LGTM