[FIX] web_editor: sanitize html pasted in codeview

Before this commit:

When we paste html using selectAll and we click code view button then the newly
added template will be visible and immediately got removed by old template. This
problem is because of pasted html is not sanitized.

After this commit:

Now when we paste html using selectAll then we actually see new html template in
result.

task-3473633

closes odoo/odoo#139384

X-original-commit: 6d6e1527ccdf5e616330905bc4b7e4fdd80c6192
Signed-off-by: David Monjoie (dmo) <dmo@odoo.com>

addons/mass_mailing/static/src/js/mass_mailing_html_field.js

@@ -250,6 +250,8 @@ export class MassMailingHtmlField extends HtmlField {
 
             if ($codeview.hasClass('d-none')) {
                 this.wysiwyg.setValue($codeview.val());
+                this.wysiwyg.odooEditor.sanitize();
+                this.wysiwyg.odooEditor.historyStep(true);
             } else {
                 $codeview.val(this.wysiwyg.getValue());
             }