[FIX] website: prevent dynamic snippet flicker in edit mode

* Prior to this commit the dynamic snippet was flickering (destroy followed
  by init) because the parallax option triggers a _refreshPublicWidgets
  in the onFocus. As such each time the user clicks somewhere in the snippet
  the snippet desapears and reappears which can be confusing for the user.

* After this commit, the parallax option will only trigger a refresh on snippets that
  are using parallax. This commit also prevent the user from selecting an element of
  the dynamic snippet as it is not customizable.

task-2339246

closes odoo/odoo#57693

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

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