fix(coverage): exclude browser mode iframe results

[AriPerkkio]

Description

• Fixes [Bug]: Weird coverage report storybookjs/storybook#29597

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[pkg-pr-new]

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@vitest/coverage-istanbul

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vite-node

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@vitest/web-worker

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vitest

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@vitest/ws-client

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commit: 70fd42e

[AriPerkkio]

/ecosystem-ci run

[vitest-ecosystem-ci]

📝 Ran ecosystem CI: Open

suite	result
aria-live-capture	✅ success
nuxt	❌ failure
nuxt-test-utils	❌ failure
elk	✅ success
effect	✅ success
lerna-lite	✅ success
zustand	✅ success
vue	✅ success
vite	✅ success
vitest-vscode	❌ failure
vitest-sonar-reporter	✅ success
vitest-github-actions-reporter	✅ success
vitest-browser-simple	✅ success
vitest-browser-examples	❌ failure
vitest-coverage-large	✅ success
vitest-reporters-large	✅ success
vitest-benchmark-large	✅ success