chore: switch percy_finalize job to small

[flotwig]

See #16289 (comment)

[cypress-bot]

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[cypress]

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Test summary

17945 • 0 • 214 • 7 • 1

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Run details

Project	cypress
Status	Passed
Commit	5dd42e4
Started	May 19, 2021 2:57 PM
Ended	May 19, 2021 3:09 PM
Duration	11:25 💡
OS	Linux Debian - 10.8
Browser	Multiple

View run in Cypress Dashboard ➡️

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Flakiness

	cypress/integration/retries.ui.spec.js		1
1	runner/cypress retries.ui.spec > opens attempt on each attempt failure for the screenshot, and closes after test passes

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