[FIX] hr: prevent launch plan for archived employee

Issue:
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The "Launch Plan" button appears for an archived employee.
It causes a traceback.

Solution:
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Do not display the button for an archived employee.

opw-3366815

closes odoo/odoo#125876

X-original-commit: 6536a88b
Signed-off-by: Kevin Baptiste <kba@odoo.com>
Signed-off-by: Thomas Lefebvre (thle) <thle@odoo.com>