Feature: Multi computer and code export/import via YAML files

[GeigerJ2]

[wip]

Why verdi comptuer setup-many instead of modifying setup

A separate verdi computer setup-many command was added rather than extending the existing setup command due to architectural constraints in AiiDA's CLI framework:

Key difficulties with modifying setup:

• Required field validation: Click validates required options (--label, --hostname, etc.) before the function executes, making it impossible to bypass validation when using config files
• ConfigFileOption conflicts: The existing ConfigFileOption automatically merges single YAML files into CLI parameters but doesn't support multiple files
• Interactive prompting system: The command's interactive behavior (prompting for missing fields) conflicts with batch operations that should be non-interactive by design

I attempted to retrofit the batch functionality onto the interactive single-computer setup command, but that either resulted in parameter validation errors, prompting conflicts, or complex workarounds that would compromise the existing user experience. In the end, adding a new setup-many command instead seemed like a better option, and provides a clean, purpose-built solution for batch operations without affecting the existing functionality.

[codecov]

Codecov Report

❌ Patch coverage is 50.72464% with 34 lines in your changes missing coverage. Please review.
✅ Project coverage is 78.99%. Comparing base (9bccdc8) to head (50e976c).

Files with missing lines	Patch %	Lines
src/aiida/cmdline/commands/cmd_computer.py	18.19%	18 Missing ⚠️
src/aiida/cmdline/commands/cmd_code.py	65.22%	16 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7007      +/-   ##
==========================================
- Coverage   79.04%   78.99%   -0.05%     
==========================================
  Files         566      566              
  Lines       43699    43754      +55     
==========================================
+ Hits        34539    34560      +21     
- Misses       9160     9194      +34     

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