feat: Add a button to open PageCreateModal in the new page creation lead

[miya]

Task

#141772 [v7] 新規ページ作成導線のドロップダウンメニュー内に Page Create Modal への導線を追加する ┗ #145461 実装

[reg-suit[bot]]

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.
:red_circle: : Changed items, :white_circle: : New items, :black_circle: : Deleted items, and :large_blue_circle: Passed items

How can I change the check status?

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