Add test coverage for ProfileForm storage field conditional removal

[Copilot]

The ProfileForm.__init__ method conditionally removes storage-related fields based on WEKO_RECORDS_UI_USER_STORAGE_MODIFICATION_ENABLED config flag, but lacked test coverage.

Changes

• Added test_init_storage_fields_removed_when_disabled to verify fields (access_key, secret_key, s3_endpoint_url, s3_region_name) are removed when flag is False
• Added test_init_storage_fields_present_when_enabled to verify fields are present when flag is True

Tests follow existing TestProfileForm patterns and use the app fixture for proper context management.

def test_init_storage_fields_removed_when_disabled(self, app):
    """Test that storage fields are removed when feature flag is disabled."""
    app.config.update(
        WEKO_RECORDS_UI_USER_STORAGE_MODIFICATION_ENABLED=False
    )
    
    with app.app_context():
        form = ProfileForm()
        
        assert not hasattr(form, 'access_key')
        assert not hasattr(form, 'secret_key')
        assert not hasattr(form, 's3_endpoint_url')
        assert not hasattr(form, 's3_region_name')

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