## Changes
Switch to use GET workspaces-files/{name} instead of workspace/export
for state files.
## Why
`/api/2.0./workspaces-files/{name}` has a higher limit which allows to
export state files larger than 10 MBs (which is the current limit for
`workspace/export`). We don't use the same API for read in other places
and fully replacing existing Filer because it doesn't correct get the
file content for notebooks and returns "File Not Found" error instead.
## Tests
All existing tests pass
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