support: Add e2e tests for editor

[yuki-takei]

Supports:

• The input of the editor is cleared when an attachment is added when a new page editing #7785
• fix: When uploading an attachment and creating a new page, it does not inherit the grant of the parent page #7768
• fix: Editor not resetting when the same markdown #7625

[reg-suit]

reg-suit detected visual differences.

Check this report, and review them.

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What do the circles mean?

The number of circles represent the number of changed images.
🔴 : Changed items, ⚪ : New items, ⚫ : Deleted items, and 🔵 Passed items

How can I change the check status?

If reviewers approve this PR, the reg context status will be green automatically.