No Recommended: Reliably select blog carousels via react props

[marcustyphoon]

Description

Enough classname targeting.

This uses our timelineObject utility to read the react internal data of recommendation carousels, reliably identifying those which are blog recommendations (as opposed to tag recommendations). This is, of course, fragile to changes in the underlying API data, but it seems better than trying to target a classname, since there aren't any unique "blog recommendation"y ones in this element.

Resolves #1346.

Testing steps

• Optionally unrevert the test commit for visibility
• Confirm that No Recommended's blog carousel hiding functionality works on the dashboard and on tag pages and doesn't hide tag recommendations (I did not do the latter; I can't find any)
• Confirm that No Recommended's blog carousel hiding functionality works on anywhere else blog recommendation carousels can appear, if any; I don't know the full list.

[marcustyphoon]

(Clarification: this isn't the only way to solve the linked issue.)

[AprilSylph]

• Blog carousels hidden on the dashboard
• Blog carousels hidden on hubs
• Tag carousels not hidden on the dashboard

it's good code