odoo/odoo#203701

Created by Garvish Pramodbhai Panchal (gppa)

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label
odoo-dev:master-imp-website-redirect-gppa
head
eeec1588ebf9b76e75dd3a4119644009ab3d404b
odoo/odoo
master #203701 missing r+

[IMP] website: show warning on 301/302 redirects for existing pages

This commit aims to: 
- Add a warning message when saving 301 & 302 redirects in website pages.
- Ensure both dynamic and static pages trigger a user alert before saving.
- If you try saving pages that are already defined on either website pages or
from controllers,

task-3861555