CloudComposerExternalTaskSensor succeeds when all task instances are outside execution_range

`CloudComposerExternalTaskSensor` and `CloudComposerExternalTaskTrigger` appear to use the same window-checking pattern that previously caused `CloudComposerDAGRunSensor` to return success when all returned runs were outside the requested execution window. Today the helper returns success as long as it does not find an in-window task instance in a disallowed state. If every returned task instance falls outside the requested `execution_range`, the helper still reports success instead of continuing to wait for a relevant in-window task instance. This follow-up issue tracks: - confirming the bug in both the sync sensor and deferrable trigger paths - adding unit coverage for all-out-of-window, mixed-window, and boundary cases - fixing both helpers so they only succeed when at least one task instance is inside the requested window and all in-window task instances satisfy the expected state set This is intentionally tracked separately from the Dag-run sensor fix to keep that PR scoped to one behavior change. --- Drafted-by: Codex (GPT-5) (no human review before posting)