[FIX] website_form: prevent crashing while parsing python dict in JS

__Description of the issue:__
- The `replace` method in JS only replace the first occurrence of a
string (unless `g` flag is used in the regex)
- There could be an apostrophe (`‘`) in a string value which would be
replaced by a quote (`“`)
- There could be “None”, “False” in a string value which would be
replaced too
- “True” is not taken into account

__Description of the fix:__
Those regex are meant to deal with more edge cases when transforming a
python dict to a JSON in JS. However there are still ways it could go
wrong. For the forward port in master, it could be a good idea to
consider converting dictionnaries directly in the backend using the
`json` python library.

__Steps to reproduce the issue:__
1. Edit the view `website_form.contactus_form`
(If `website_crm` is installed, either uninstall it or disable the
`website_crm.contactus_form` view)
2. At line 4, change the attribute `t-att-data-values` to a more
complicated dict like:
```
"{'email_to': res_company.email, 'name': 'Alice True', 'age': None, 'active': True, 'attr1': None , 'attr2': False , 'attr3': 'let\'s go'}"
```
3. Go to `/contactus` on the website
↳ Traceback

opw-3328690
task-3340946

closes odoo/odoo#124975

Signed-off-by: Romain Derie (rde) <rde@odoo.com>

addons/website_form/static/src/snippets/s_website_form/000.js

@@ -65,7 +65,16 @@ odoo.define('website_form.s_website_form', function (require) {
             // Because, using t-att- inside form make it non-editable
             var $values = $('[data-for=' + this.$target.attr('id') + ']');
             if ($values.length) {
-                var values = JSON.parse($values.data('values').replace('False', '""').replace('None', '""').replace(/'/g, '"'));
+                const values = JSON.parse($values.data('values')
+                    // replaces `True` by `true` if they are after `,` or `:` or `[`
+                    .replace(/([,:\[]\s*)True/g, '$1true')
+                    // replaces `False` and `None` by `""` if they are after `,` or `:` or `[`
+                    .replace(/([,:\[]\s*)(False|None)/g, '$1""')
+                    // replaces the `'` by `"` if they are before `,` or `:` or `]` or `}`
+                    .replace(/'(\s*[,:\]}])/g, '"$1')
+                    // replaces the `'` by `"` if they are after `{` or `[` or `,` or `:`
+                    .replace(/([{\[:,]\s*)'/g, '$1"')
+                );
                 var fields = _.pluck(this.$target.serializeArray(), 'name');
                 _.each(fields, function (field) {
                     if (_.has(values, field)) {