Add cube health to status page

[ptbrowne]

Map was not working because of missing dimensions in the cube shape (only on lindas cached, not on normal lindas). Here I added a cube health endpoint whose result is shown on the api-status page.

This way, we can check if all the dimensions are there. Since this page is monitored by betteruptime, we will be warned if it ever happens again.

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[ptbrowne]

I am not sure if the Cube Health should appear on the website if everything is fine?

It's on the /_system/api-status page which is internal and checked by betteruptime ;)

[bprusinowski]

Nice, thanks!