In pipelines, improve handling failures during retries in main and post steps

[ThorbenLindhauer]

This issue was imported from JIRA:

Field	Value
JIRA Link	CAM-13641
Reporter	@yanavasileva
Has restricted visibility comments	true

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Follow up on CAM-13593 where we added a catch in post actions and stage status change in case of error.

Acceptance Criteria (Required on creation):

• Stage should be marked as successful in case of a success on first run or retry
• Stage should be marked as failed in case of a failure in main step, no matter of the post step status. However, post action failure must not prevent step retry.
• Stage should be marked as unstable in case of small problem, for example main step is successful but post action step fails in the last trigger of the stage. The stage must not be marked unstable if the last execution of steps is successful (this is the outcome of CAM-13593 and might create confusion when checking build results gives false positive.

Hints (Optional):

Links:

• is related to https://jira.camunda.com/browse/CAM-13643
• is related to https://jira.camunda.com/browse/CAM-13593