Enable autosaves for non-drafts

[swissspidy]

Context

See #1402 / #9859 for context.

Summary

This change removes* the isDraft check for the autosave handler, causing autosaves to work even if the story is private, scheduled, or published. For published stories, it will create a new revision.

We'll add a link for users to manage revisions soon, see #12197.

* It does not actually remove the check, just disable it if the autosave experiment is on.

Relevant Technical Choices

To-do

User-facing changes

No visual change.

Testing Instructions

• This is a non-user-facing change and requires no QA

This PR can be tested by following these steps:

0. Enable autosave experiment
1. Publish a story
2. Make some changes
3. Wait a minute or so
4. Observe network tab, see that an autosave happened

Reviews

Does this PR have a security-related impact?

No

Does this PR change what data or activity we track or use?

No

Does this PR have a legal-related impact?

No

Checklist

• This PR addresses an existing issue and I have linked this PR to it in ZenHub
• I have tested this code to the best of my abilities
• I have verified accessibility to the best of my abilities (docs)
• I have verified i18n and l10n (translation, right-to-left layout) to the best of my abilities
• This code is covered by automated tests (unit, integration, and/or e2e) to verify it works as intended (docs)
• I have added documentation where necessary
• I have added a matching Type: XYZ label to the PR

---

See #1402

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[timarney]

Tested and it works --- looks like a unit test is failing

AutoSaveHandler › should not trigger saving in case of a non-draft post

[swissspidy]

Test should be fixed now 👍