[Webform 8.x-5.4] Split STATE_DRAFT into STATE_DRAFT_CREATED and STATE_DRAFT_UPDATE

Problem/Motivation

@see #3028272: "Do not scheduled email if the action should be triggered in the past" does not appear to be working properly.

Proposed resolution

Split STATE_DRAFT into STATE_DRAFT_CREATED and STATE_DRAFT_UPDATE

Remaining tasks

• Add STATE_DRAFT_CREATED and STATE_DRAFT_UPDATE to WebformSubmissioninterface
• Update \Drupal\webform\Entity\WebformSubmission::getState
• Convert WebformSubmissionInterface::STATE_DRAFT to ::STATE_DRAFT_CREATED and ::STATE_DRAFT_UPDATED
• Write update hook that converts STATE_DRAFT to ::STATE_DRAFT_CREATED and ::STATE_DRAFT_UPDATED
• Write code to account for old 'draft' ::isStateTriggered($state, $states)
• DRAFT_CREATED and DRAFT_UPDATE as DRAFT to $states array.
• Update tests

Notes

• Still use STATE_DRAFT for filtering

User interface changes

• Adding Draft created and updated to submission states

API changes

• ActionWebformHandler
• EmailWebformHandler
• RemotePostWebformHandler

Data model changes

N/A

Release notes snippet

TDB