do not re-validate on blur if already validated

[joelhawksley]

In testing #76 in GitHub.com, we discovered cases where input would be re-validated on blur even if the input had not changed. This PR updates our valid and invalid code paths to only validate on blur if the input has not otherwise been already validated.

(for Hubbers) See internal issue: https://github.com/github/new-user-experience/issues/242, task #1.

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Comments skipped due to low confidence (2)

test/auto-check.js:63

• The test case 'does not emit on blur if input has not changed after initial blur' should also verify that the 'dirty' attribute is removed after validation to ensure the attribute is correctly managed.

it('does not emit on blur if input has not changed after initial blur', async function () {

src/auto-check-element.ts:228

• The condition should check for the absence of the 'dirty' attribute to avoid re-validating on blur if the input has not changed. Replace autoCheckElement.hasAttribute('dirty') with !autoCheckElement.hasAttribute('dirty').

autoCheckElement.hasAttribute('dirty')) ||

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