Fix ampersand encoding in tokens - backport to 4.4

[JaZo]

Q	A
Bug fix? (use the a.b branch)	[x]
New feature/enhancement? (use the a.x branch)	[ ]
Deprecations?	[ ]
BC breaks? (use the c.x branch)	[ ]
Automated tests included?	[x]
Related user documentation PR URL	N/A
Related developer documentation PR URL	N/A
Issue(s) addressed	Fixes #11643

Description:

Backport of #11644.

Steps to test this PR:

1. Open this PR on Gitpod or pull down for testing locally (see docs on testing PRs here);
2. Make sure you have a contact;
3. Create a template email and use {url} as the URL of a link;
4. Call the API endpoint: /api/emails/[ID OF EMAIL]/contact/[ID OF CONTACT]/send with body:

{
    "tokens": {
        "url": "https://localhost/test?foo=bar&email=john.doe%40example.com"
    }
}

5. Click the link in the received email;
6. See you're redirected to https://localhost/test?foo=bar&email=john.doe%40example.com instead of https://localhost/test?foo=bar&email=john.doe%40example.com.

[codecov]

Codecov Report

Merging #11676 (c0fe163) into 4.4 (7c88b6f) will increase coverage by 0.00%.
The diff coverage is 66.66%.

@@            Coverage Diff            @@
##                4.4   #11676   +/-   ##
=========================================
  Coverage     49.96%   49.97%           
  Complexity    35410    35410           
=========================================
  Files          2144     2144           
  Lines        106303   106301    -2     
=========================================
+ Hits          53117    53120    +3     
+ Misses        53186    53181    -5     

Impacted Files	Coverage Δ
app/bundles/EmailBundle/Entity/Email.php	79.64% <0.00%> (+0.70%)	⬆️
app/bundles/PageBundle/Model/RedirectModel.php	21.05% <0.00%> (+0.36%)	⬆️
app/bundles/PageBundle/Model/TrackableModel.php	56.19% <50.00%> (+0.35%)	⬆️
app/bundles/CoreBundle/Helper/UrlHelper.php	65.00% <100.00%> (+1.20%)	⬆️
...bundles/PageBundle/Controller/PublicController.php	46.33% <100.00%> (ø)
...bundles/LeadBundle/Controller/ImportController.php	59.55% <0.00%> (-0.32%)	⬇️

[escopecz]

Please check the failing STAN issues.

[JaZo]

Please check the failing STAN issues.

Done!

[escopecz]

Thanks! The code looks good 👍

[volha-pivavarchyk]

Works well