[clsi] run SyncTeX in specific output dir rather than compile dir (#24690)

* [clsi] drop support for docker-in-docker

* [clsi] run SyncTeX in specific output dir rather than compile dir

* [clsi] store output.synctex.gz outside of tar-ball in clsi-cache

* [clsi] add documentation for rewriting of docker bind-mounts

* [server-pro] update env vars for sandboxed compiles in sample config

GitOrigin-RevId: 8debd7102ac612544961f237aa4ff1c530aa3da3

develop/docker-compose.yml

@@ -29,6 +29,7 @@ services:
       - DOCKER_RUNNER=true
       - TEXLIVE_IMAGE=texlive-full # docker build texlive -t texlive-full
       - COMPILES_HOST_DIR=${PWD}/compiles
+      - OUTPUT_HOST_DIR=${PWD}/output
     user: root
     volumes:
       - ${PWD}/compiles:/overleaf/services/clsi/compiles