[FIX] web: redirectWarningDialog does not markup noContentHelp HTML

The bank recon custom view relies on the noContentHelper. (When there are no records, a custom noContentHelper is  displayed including buttons to clear filters)

When the view is activated from a RedirectWarning, the action's help text is not marked up
therefore displaying raw html in the UI.

With this fix, the actions help key is marked up (very similar to the doActionButton)

To reproduce:
- On a DB with demo data
- Accounting -> Actions -> Lock Dates
- Set a lock date for all users (after the last unreconciled date, ensure there are no unposted moved before this date)
- You will be presented with a Redirect Warning Dialog
- Click Show Unreconiled Bank Statement Lines
- If there are lines, use the filter to search for "SomethingThatWontReturnRecords"
- You will see raw html

Task-3366470

closes odoo/odoo#125254

Related: odoo/enterprise#42641
Signed-off-by: Laurent Smet <las@odoo.com>