dev: only trigger generate for schema/*.json

Created by: keegancsmith

The watch rules trigger handle-change.sh. handle-change.sh had a section for "schema/*.json" which would cause us to run go generate in schema. However, the watchman rule was for any file in schema. This change makes the watchman rule the same.

handle-change.sh has a fallback rule of build everything. There was a webstep that wrote to "schema/out". This would then trigger the fallback option of rebuilding everything. The symbols build uses cgo which does not seem to be a idempotent build. This lead to the symbols build often being rebuilt on startup.

Co-authored-by: Erik Seliger [email protected]