[GraphQL] cleanup

Removed Tree endpoints. Cleaned up others.

This should be tested together with purescript changes:
purescript-gargantext@0a62761a
4 jobs for 467-dev-graphql-refactoring in 15 minutes and 34 seconds (queued for 5 seconds)
latest
Status Job ID Name Coverage
  Cabal
failed #18143
cabal

00:15:34

 
  Stack
skipped #18144
stack
 
  Bench
skipped #18145
allowed to fail manual
bench
 
  Test
skipped #18146
test
 
Name Stage Failure
failed
cabal Cabal
+ [[ a9659d90dc9a80f736585927577d49162c9224cb6fa961d46ed29e705ac516e1 != cd52143d3a9d285360b59c6371d3e258552c1bc115bd612024db3de1f7593ff7 ]]
+ echo -e '\e[31mERROR! hash mismatch between expected cabal.project.freeze and the one computed by cabal2stack.\e[0m'
stack.yaml updated successfully.
ERROR! hash mismatch between expected cabal.project.freeze and the one computed by cabal2stack.
+ echo -e '\e[33mPlease update the hashes inside the '\''./bin/update-project-dependencies'\'' file.\e[0m'
+ exit 1
Please update the hashes inside the './bin/update-project-dependencies' file.
Cleaning up project directory and file based variables
ERROR: Job failed: exit code 1