Removes the dedicated configuration options for app polling.

These options are no longer needed as the polling mechanism
has been simplified.

Enhances the Nextmv application step decorator with comprehensive documentation and examples.

Adds functionalities for configuring polling options, including the ability to set timeouts, backoff strategies, and stop conditions. These options allows users to customize the polling behavior of the application.

Ensures that the initial delay of the polling is randomized to avoid overloading the platform and a stop condition to allow a user to cancel the process.

Removes the `wait_for_runs` function from `utils.py` as it is no longer used.

Also, standardizes imports in `threads.py`.

Updates the nextmv dependency to the latest version.

This change ensures compatibility with the newest features and
improvements in the nextmv library.

Co-authored-by: Marius Merschformann <marius.merschformann@gmail.com>

…r docs

…er-on-start-of-polling-for-runs-in-fanout' into feature/eng-5848-add-random-jitter-on-start-of-polling-for-runs-in-fanout

…ter-on-start-of-polling-for-runs-in-fanout