Add Status.RECOVERED

[LanderOtto]

This commit introduces Status.RECOVERED to support recovery workflows, specifically those involving LoopCombinatorStep.

Before this commit, LoopCombinatorStep terminated only when all input ports received an IterationTerminationToken containing the iteration's prefix tag and a TerminationToken. Now, the RECOVERED status can be used within a TerminationToken to trigger termination for every step execution (including LoopCombinatorStep), behaving similarly to CANCELLED and FAILED statuses. (logic within _reduce_statuses function)

Note that while the internal termination is triggered by RECOVERED, the step propagates a TerminationToken with Status.COMPLETED to the output ports (logic within _get_status method). This ensures that the logic for abrupt termination is managed by the recovery workflow structure (e.g., via InterWorkflowPort boundary rules) rather than the step itself.

[codecov]

Codecov Report

❌ Patch coverage is 37.50000% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 73.64%. Comparing base (3653a82) to head (61336f0).
⚠️ Report is 1 commits behind head on master.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
streamflow/workflow/step.py	0.00%	2 Missing and 2 partials ⚠️
streamflow/workflow/port.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #958      +/-   ##
==========================================
- Coverage   73.66%   73.64%   -0.03%     
==========================================
  Files          90       90              
  Lines       12223    12228       +5     
  Branches     2161     2163       +2     
==========================================
+ Hits         9004     9005       +1     
- Misses       2704     2706       +2     
- Partials      515      517       +2     

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