Upgrade Flow to v0.145

[mourner]

Upgrade Flow from v0.142 to v0.145 as a part of #12194. This was a difficult push because v0.143.0 fixed a bug which made Flow basically ignore many of the library definitions, leading to ~140 errors that were not caught before. A few notes:

• I had to inline @mapbox/geojson-types instead of using that package because the latter no longer works for reasons I don't really understand. On a positive note, we could now deprecate that package because it's no longer used anywhere else.
• @mapbox/vector-tile-related changes are due to the need to differentiate between VectorTile/etc. class instances vs objects that fit corresponding interfaces (which is needed for our GeoJSONWrapper logic which wraps GeoJSON to imitate VT classes).
• There are many fixes related to objects that are expected to be of a certain type but could be undefined, something Flow didn't handle in all cases before.
• The config ignores were cleaned up of packages we no longer use.

Launch Checklist

• [x] briefly describe the changes in this PR
• [x] manually test the debug page
• [x] apply changelog label ('bug', 'feature', 'docs', etc) or use the label 'skip changelog'