## Summary
Fixes https://github.com/elastic/kibana/issues/143322
This PR adds an option to store dynamic parameters when a step is
completed to be used later for dynamically built URLs.
### How to test
1. Add `xpack.cloud.id: 'testID'` to your `/config/kibana.dev.yml` file
2. Start ES with `yarn es snapshot`
3. Start Kibana with `yarn start --run-examples`
4. Navigate to the guided onboarding example plugin
`http://localhost:5601/app/guidedOnboardingExample`
5. Start the test guide and when completing step 1 provide any value for
the paramter `indexName`
6. Continue the guide until step 4 and check that the correct value is
being used for the url of this step.
### Checklist
- [x] [Unit or functional
tests](https://www.elastic.co/guide/en/kibana/master/development-tests.html)
were updated or added to match the most common scenarios
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Co-authored-by: Kibana Machine <42973632+kibanamachine@users.noreply.github.com>
