Provide DCAR JSON For Galleries

[JamieB-gu]

Currently, when requesting JSON for a gallery, forceDCR is ignored. This is because the request has to be categorised as a "remote render" for DCAR JSON to be provided. However, this JSON is provided by frontend, not DCAR, so it's not accurate to call it a "remote render".

This change creates a separate case, apart from the "remote render" logic, to handle DCAR JSON for galleries.

Note: Prior to #27556 it would still have been possible to get DCAR JSON, because forceDCR would have categorised the request as a "remote render". However, as mentioned above, this is not a "remote render", so the solution is to make the change here rather than reverting or altering that PR.

[github-actions[bot]]

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