[qa][e2e] QA Indexing/Reindexing in the Playground and Webview

Problem to Solve

For the upcoming internal release, we need to validate:

• The lifecycle of the KG HTTP "daemon"
  • robust against race-conditions when modifying .gkg/
  • ensuring that Kuzu .lock errors do not get triggered if multiple instances of the axum server are running
  • gracefully shuts down in a variety of conditions
    • includes file watcher thread shutdown, and job queue flushing
  • handling new workspaces in the watcher
  • preventing re-indexing jobs from running while indexing jobs are running for a workspace
  • strictly defined behavior when indexing and re-indexing jobs fail
    • this includes rollbacks and enforced transactions for kuzu writes
  • strictly defined behavior on when to trigger force index

Proposed Solution