Steps to reproduce:
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1. Install `hr_appraisal_skills` module
2. Create a new employee and assign at least one skill to the employee
3. Set the Next Appraisal Date to today
4. Go to Scheduled Actions > Appraisal: Run employee appraisal > Run Manually
5. Open the newly created appraisal for the employee

Observation:
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In the Skills tab, the employee's skills are not populated even though the appraisal is already in the confirmed stage

Issue:
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When the cron  `_run_employee_appraisal_plans` creates an appraisal, it is created directly in `pending` state via  `create()`. The skill-copying logic only lived in the  `write()` override, which triggers on state transitions from 'new' to 'pending'. Since  `create()` bypasses  `write()`, Employee skills were never copied to cron-created appraisals

https://github.com/odoo/enterprise/blob/451dce92a087086fc3d5d5f610626312f32bcd13/hr_appraisal_skills/models/hr_skills.py#L12-L15

Solution:
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Add a `create()` override to call `_copy_skills_when_confirmed` when an appraisal is created directly in the `pending` state, ensuring employee skills are properly copied.

opw-5491433