When we haven't provided a custom action, the tour step runs the default
action. In the final step of the tour, when there is no `run` or
`isCheck` provided, we don't want to execute the default action as it
can lead to a race condition.
With this commit [1], from saas-16.3 we have refactored the web_tour to
OWL. During the refactoring, it lost the condition initially introduced
by PR[2] that handles the final step of tours.
So this commit,
1. Restored the missing condition.
2. Replaced the simple `console.log()` with a warning, because it's easy
to miss the log compared to a warning.
[1]: https://github.com/odoo/odoo/commit/3a798039d6f200f8e28448ddb6a2d3c46654a203
[2]: https://github.com/odoo/odoo/commit/9733f6e1ab31abf780a5ad671f700fac883b63ee
task-3429500
Part-of: odoo/odoo#129239