[FIX] web_editor: prevent switching to text tools immediately

On editor start, "the cursor enters editable text" at a "random" time
thus switching immediately to text tools or not depending on the fact
text tools switching was initialized or not. We now only allow to do so
after some fixed delay after the editor is ready, to prevent any
automatic switching on editor start (which may break tours).

Part of https://github.com/odoo/odoo/pull/60383


task-2352339

closes odoo/odoo#60383

Signed-off-by: Quentin Smetz (qsm) <qsm@odoo.com>