fix(core): remove mount validation on touch

[Balastrong]

This PR closes #689

A few considerations:

1. When should we remove the errors?
   My proposal would be to remove each field individually when gets touched and the form as soon as a field is touched.
   As long as a field is not touched, it keeps the mount errors.

2. Should we be able to submit a form with onMount errors?
   I'd say no, but currently if state.submissionAttempts === 0 && !isTouched we have canSubmit: true
   Adding && !hasOnMountError also aims to fix the unwanted behavior described in canSubmit is always true on first render of form #723

3. We might want to explicitly explain in the docs how we intend onMount to behave
   I'm happy to improve the docs in this PR if we decide to go through with the proposed behavior

4. Bonus
   The amount of eslint disable on form.errorsMap makes me wonder if we should consider it as optional in first place, but that's maybe another topic.

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