feature: Disable primary keypair deletion

[lizable]

• related: backend.ai#1761
• required Core version: 24.03.0 or newer version
  • You need to upgrade alembic version to the latest by executing the following command in Core directory:

     ./py -m alembic upgrade head
    

FYI:
User management in Backend.AI has two groups, user and keypair.
The relationship btw user and keypair is 1:N relationship, but we regarded as 1:1 relationship.
Both user and keypair has each status and works independently.

In this PR, most of implementation is mainly focused on "main_access_key", considering the relationship between user and keypair (user can have multiple keypairs.)

• Prevent from deleting main access key by disabling "purge" button (red button in controls column at credentials table)
  • Even if user change the status of icon and requests purge, server returns error.
• Add Main Access Key tag in Access key column where access key is the main access key
• Add Main Access Key Column in users tab
• Show Main Access Key in User detail dialog

Checklist: (if applicable)

• Mention to the original issue
• Documentation
• Minimum required manager version
• Specific setting for review (eg., KB link, endpoint or how to setup)
• Minimum requirements to check during review
• Test case(s) to demonstrate the difference of before/after

Screenshot(s)

[github-actions]

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Test suite run success

17 tests passing in 4 suites.

Report generated by 🧪jest coverage report action from f0d88e1

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[agatha197]

I suggested just one additional condition. Other things are LGTM.

[agatha197]

LGTM