[IMP] test_generic: add warning when templates is noupdate

[frva-odoo]

Templates should be updated.
This PR modifies the generic test _check_update_status to also test templates,
and raise a warning if those are marked as noupdate="1".
It also removes the noupdate attributes found for the templates.

TASK-6064474

[robodoo]

[vava-odoo]

You'll probably have to add portal.entry to the list as well in the forward port

[vava-odoo]

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[robodoo]

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[vava-odoo]

@robodoo remindme:saas-19.1="add portal.entry to the list"
let's try this

[vava-odoo]

@robodoo squash

[robodoo]

Merge method set to squash.

[vava-odoo]

@robodoo r+