Modify `TextField` to use different auto-check functionality

[acbreton]

As mentioned by @camertron in this Slack thread, we're hoping to update the Primer::Alpha::TextField component so that it leverages the auto-check code found in auto-check.ts. There was an issue with trying to read a response object with text() after it had already been consumed in the auto-check utility method.

More info in this Slack thread.

@camertron :

• Upstream the autocheck.ts code into PVC, which has a lot more mechanisms for announcing, etc than github/auto-check-element does.
• Modify PVC to automatically attach that js-prevent-default-behavior class, or potentially monkeypatch in dotcom somehow.

[lesliecdubs]

Hi @acbreton, thanks for the details on this. Are you working within a specific timeline for this change?

[acbreton]

Hey there, I don't believe we are blocked on this as we are using js-prevent-default-behavior as a workaround for now.

Thanks for asking!