Edit Page V2: Return the `onNumberOfPages` property on `/v1/page/json` endpoint

[rjvelazco]

Parent Issue

https://github.com/dotCMS/core/issues/27546

Task

We need to retrieve the onNumberOfPages property on The /v1/page/json endpoint. We already do this in the render version of the endpoint (/v1/page/render). See the example here.

Proposed Objective

Core Features

Proposed Priority

Priority 3 - Average

Acceptance Criteria

Every contentlet present on the page should have its own onNumberOfPages property.

External Links... Slack Conversations, Support Tickets, Figma Designs, etc.

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Assumptions & Initiation Needs

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Quality Assurance Notes & Workarounds

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Sub-Tasks & Estimates

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