Default to `raise_errors=True` in `find_pipelines`

[deepyaman]

Thanks, a bit late to the discussion. I agree we should not change the behavior in a micro release.

In principle I like a default=True, but with concern about discoverability and the ergonomics of this. I imagine this is like a switch that you may need to turn on & off from time to time, going into pipeline_registry.py to do so feel inconsistent with other CLI options etc.

Originally posted by @noklam in https://github.com/kedro-org/kedro/pull/3823#pullrequestreview-2069612447

TODO:

• [ ] Default to raise_errors=True in next major release
• [ ] Warn that the default behavior will change? Not sure whether this is worth it—the warning would be annoying on each run
• [ ] Expose a config option for raise_errors?

[bpmeek]

Something I would like to see is changing the default entry in pipeline_registry.py to find_pipelines(raise_errors=True) (or False whichever is decided upon), I didn't know until yesterday that this was even a functionality of find_pipelines().

Which may even open up a broader question of "Should Kedro populate default options in the boilerplate to let users know its there?"