chore(preact-query-devtools): replace the stale 'root.tsdown.config.js' copy with a symlink to the shared config

The number of task failures allowed before the run group is marked failed. Zero means never fail (always finish), one stops on the first failure.

Nx Cloud monitors the run for stalled progress and marks it failed if no agent reports in for too long.

Targets that mark this CI run complete once every one of them has finished.