Display message when CoCo disk creation abort

[olethanh]

Fix the disk creation script to add a more clean message when any step fail.

Related ClickUp, GitHub or Jira tickets : ALEPH-211

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.
• [N/a] An LLM was used to review the new code and look for simplifications.
• [N/a] New classes and functions contain docstrings explaining what they provide.
• [N/a] All new code is covered by relevant tests.
• [N/a] Documentation has been updated regarding these changes.

Changes

How to test

Follow the step described there https://docs.aleph.im/computing/confidential/encrypted-disk/

Print screen / video

Upload here screenshots or videos showing the changes if relevant.

Notes

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 62.45%. Comparing base (90bae31) to head (b8180ce).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #709   +/-   ##
=======================================
  Coverage   62.45%   62.45%           
=======================================
  Files          69       69           
  Lines        6139     6139           
  Branches      645      645           
=======================================
  Hits         3834     3834           
  Misses       2153     2153           
  Partials      152      152           

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[nesitor]

LGTM