Simpleflow

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- (Merge pull request 417 from botify-labs/task/DATA-17957/Simpleflow-remove-kubernetes-support)
- (Merge pull request 415 from botify-labs/improvement/DATA-16022/Simpleflow-Improve-error-handling-and-helpers-for-failed-tasks)

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* Merge pull request 414 from botify-labs/task/DATA-17843/Simpleflow-implement-ContinueAsNew
* Unrelated: Improve typing
* Create ContinueAsNewWorkflowTask
* Executors, Workflow: add continue_as_new
* simpleflow/history.py: add last_event_id
* Document continue_as_new, add example
* Review fix: try improving the documentation
* Unrelated: `import annotations` in script/release
* Update ci.yml

Cancel GitHub actions when pushing new commits.
* Add propagate_signals_to_parent

This is sometimes needed to prevent the parent workflow being confused
by unknown signals.
* Unpin Jinja2 and markupsafe
* markupsafe has breaking changes for callers expecting v0.x.
* Update docs/src/features/signals.md

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- (Merge branch 'enhancement/403/Canvas_misc_enhancements' into main)
- (Merge branch 'enhancement/399/execute.python_add_env_argument' into main)
- (Merge branch 'enhancement/397/decider.start_work_without_workflows' into main)
- (Merge branch 'enhancement/395/workflow.filter_add_start_close_timestamps' into main)

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