Mark parent step as failed if child step failed with soft check (fix #827)

[sharovd]

Context

• Implementation of feature request Mark high level step as failed if low level step with soft check failed #827
• Added sync_steps_statuses() method to synchronise the status for the parent step based on the status of the child steps. This method returns True if at least one nested step has failed — allowing the parent step or the test itself to be marked as failed
• Added test test_pytest_fail_in_nested_step_with_soft_check() to validate the described test scenario
• Here is an example of allure report after the fix:

Checklist

• Sign Allure CLA
• Provide unit tests