Implement Credits payment on Notify endpoint

[nesitor]

Feature: Support Credits payment method on the notify endpoint.

Self proofreading checklist

• The new code clear, easy to read and well commented.
• New code does not duplicate the functions of builtin or popular libraries.
• An LLM was used to review the new code and look for simplifications.
• New classes and functions contain docstrings explaining what they provide.
• All new code is covered by relevant tests.
• Documentation has been updated regarding these changes.
• Dependencies update in the project.toml have been mirrored in the Debian package build script packaging/Makefile

Changes

Integrated credits payment method on the notify endpoint

How to test

Try to send an instance using credits payment method and notify it on the CRN.

[1yam]

LGTM

[1yam]

LGTM

[codecov]

Codecov Report

❌ Patch coverage is 17.85714% with 23 lines in your changes missing coverage. Please review.
✅ Project coverage is 64.67%. Comparing base (c79a8cc) to head (d85f1b7).
⚠️ Report is 7 commits behind head on main.

Files with missing lines	Patch %	Lines
src/aleph/vm/orchestrator/payment.py	20.00%	12 Missing ⚠️
src/aleph/vm/orchestrator/views/__init__.py	0.00%	11 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #834      +/-   ##
==========================================
- Coverage   64.84%   64.67%   -0.18%     
==========================================
  Files          87       87              
  Lines        8095     8121      +26     
  Branches      723      733      +10     
==========================================
+ Hits         5249     5252       +3     
- Misses       2620     2642      +22     
- Partials      226      227       +1     

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