Ran `check` against a 2024.1.1 Develocity instance:
https://gradle.com/s/dv5yxmgrb4ah4

- The `buildStartTime` operator was inverted, causing the examples run
time to be much longer than expected when API cache is off
- `buildOutcome:failed` shouldn't be in the examples, since they're
supposed to present all builds

- Simplify queries to make it easier to test against fresh instances,
e.g. with no builds tagged for `tag:local`.
- Ensure examples fail if 0 builds. Before, script and project examples
would skip code such as `List.map` logic, hiding potential issues when
testing. The notebook example would fail later in the plotting step with
a non-obvious message:

```
java.lang.IllegalStateException: Column 'count' not found among [tasks].
```

---------

Co-authored-by: Clay Johnson <cjohnson@gradle.com>