[FIX] account,sale: colspan revert part of e2e27b41a

In e2e27b41a variable `colspan` and several `<t t-set="colspan"/>` were
removed replacing `t-att-colspan="colspan"` with `colspan="99"`.

- sale_management.sale_order_portal_content_inherit_sale_management has
  `<t t-set="colspan" t-value="colspan+1"/>` overidding the portal view
  sale.sale_order_portal_content which so may result in error 500
  because colspan variable does not exist

- when doing a customization adding a column, adding:
  `<t t-set="colspan" t-value="colspan + 1"/>` was the expected behavior
  which after colspan change would break

So this changeset reintroduce `<t t-set="colspan"/>` tag up to not
including master, they will have no effect but possible existing xpath
or use of the variable colspan will no longer cause an error.

note: for 12.0 up to saas-12.3 (not necessary in master)
opw-1965886
closes #32539

Signed-off-by: Nicolas Lempereur (nle) <nle@odoo.com>

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