Check message status before checking the payment

[nesitor]

Problem: If a user allocates a VM and later forgets the VM, the payment task fails because cannot get the price for that execution.

Solution: Check the message status before checking the price and remove the execution if it is forgotten or on a different status than processed.

[codecov]

Codecov Report

Attention: Patch coverage is 33.33333% with 12 lines in your changes missing coverage. Please review.

Project coverage is 61.28%. Comparing base (2f68012) to head (3428137).
Report is 5 commits behind head on main.

Files	Patch %	Lines
src/aleph/vm/orchestrator/messages.py	40.00%	6 Missing ⚠️
src/aleph/vm/orchestrator/tasks.py	25.00%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #679      +/-   ##
==========================================
- Coverage   61.44%   61.28%   -0.16%     
==========================================
  Files          68       68              
  Lines        5994     5998       +4     
  Branches      635      635              
==========================================
- Hits         3683     3676       -7     
- Misses       2156     2168      +12     
+ Partials      155      154       -1     

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