chore: Revert submit validation

[chrisbreiding]

Reverts #14965 and #15266.

Sorry @sainthkh, I merged the submit validation PR prematurely before we discussed it as a team. In case we decide it's not the desired behavior, we'd rather not implement it for the time being, because reverting it would be another breaking change. We're erring on the side of keeping it out of this release until we can prioritize and fully discuss how we'd like to handle this.

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[cypress]

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Test summary

9374 • 0 • 118 • 3 • 1

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Run details

Project	cypress
Status	Passed
Commit	89a7ec6
Started	Mar 3, 2021 3:12 PM
Ended	Mar 3, 2021 3:23 PM
Duration	10:56 💡
OS	Linux Debian - 10.5
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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[sainthkh]

OK, I also didn't check it solves all the problems.