alfa-test-utils: Skip content in <iframe> by default.

[Jym77]

Resolves II-8343

[changeset-bot]

🦋 Changeset detected

Latest commit: 90387fb

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 27 packages

Name	Type
@siteimprove/alfa-test-utils	Patch
@siteimprove/alfa-angular	Patch
@siteimprove/alfa-assert	Patch
@siteimprove/alfa-chai	Patch
@siteimprove/alfa-cheerio	Patch
@siteimprove/alfa-cli	Patch
@siteimprove/alfa-command	Patch
@siteimprove/alfa-crawler	Patch
@siteimprove/alfa-cypress	Patch
@siteimprove/alfa-enzyme	Patch
@siteimprove/alfa-formatter-earl	Patch
@siteimprove/alfa-formatter-json	Patch
@siteimprove/alfa-formatter-sarif	Patch
@siteimprove/alfa-formatter	Patch
@siteimprove/alfa-frontier	Patch
@siteimprove/alfa-interviewer	Patch
@siteimprove/alfa-jasmine	Patch
@siteimprove/alfa-jest	Patch
@siteimprove/alfa-jquery	Patch
@siteimprove/alfa-playwright	Patch
@siteimprove/alfa-puppeteer	Patch
@siteimprove/alfa-react	Patch
@siteimprove/alfa-scraper	Patch
@siteimprove/alfa-selenium	Patch
@siteimprove/alfa-unexpected	Patch
@siteimprove/alfa-vue	Patch
@siteimprove/alfa-webdriver	Patch

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