Supporting lingering ash survey

[florence-77]

When we change survey questions in the app, if we add or remove any questions or change the name of any questions, we must update the website to ensure continued proper functioning. Before we push the new ash survey live, please do the following and then test locally that the full cycle (mobile app to viewing/dowloading observation on website) functions correctly.

See MetaLabels.php, where we list all fields and link them to a public-facing string, and also link each tree to its filters: https://github.com/statonlab/Treesnap-website/pull/601/files#diff-5bcd22e2ba46efab618a28682547e6045ef6223493d3d430a38e37a8c5e2e678

If any of the new filters support multiple options being checked at once, be sure to follow the pattern in this PR: https://github.com/statonlab/Treesnap-website/pull/622/files#diff-58bf29fe38b2000b72161d866734b9437a87bfdffe82fd9eb3cf77f6b2537b7c