aio-interface: Fix wording in update backup warning dialog (Start and update -> Update and start)

[Chesterfield93]

• Resolves: Cosmetics: Manual Update warning dialog box has incorrect wording #8442

Summary

Fixes the wording on the "Start and update containers" button and in the corresponding confirmation dialog.
The dialog previously said "Start and update containers?" even though the
update is actually pulled/applied before the containers are started again.
Changed wording in all occurrences to "Update and start containers?" to reflect the actual order of
operations, matching the button's behavior.

Also updated the accompanying description text in the containers overview
page, readme.md, develop.md and the corresponding Playwright test (restore-instance.spec.js) for
consistency.

Labels/milestone: please add :)

Did not test; did not do screenshots

AI was used to guide me through this first-ever PR of mine.

• The PR was tested and verified that it works locally
• Sign-off message is added to all commits
• Tests (playwright if possible) are included
• Screenshots before/after for front-end changes
• Documentation has been updated or is not required
• Labels added where applicable (ex: bug/enhancement, 3. to review, feature component)
• Milestone next added

AI (if applicable)

• The content of this PR was partly or fully generated using AI

[Chesterfield93]

If possible, feel free to review 🙂
This is a very small PR - should not be a big thing.

[szaimen]

@pabzm WDYT about this change? :)

[pabzm]

@Chesterfield93 Sorry for letting you wait, and thank you for the contribution! I'd merge this, unfortunately it as conflicts with the main branch now. Could you resolve those, please?

[Chesterfield93]

@pabzm Done

[szaimen]

Honestly this makes the UX worse from my POV