🐛 [#2665] Fix phone-parsing Safari (iOS only)

[jiromaykin]

Taiga: https://taiga.maykinmedia.nl/project/open-inwoner/issue/2665

The turn-numbers-into-phone-links feature should be disabled with the format-detection meta-tag, but... on every Safari and iOS update this breaks again 😡; many users on new devices report the meta tag does not solve the problem, so we need to create a hack with pointer-events is zero and add a zero-width joiner ‍ to make the numbers unrecognizable.
I've also added these to the Zaaknummers e-mail templates, since those are also parsed in iOS.

While I was reproducing all this in Browserstack I found a bug in the skip-link in Safari which is also solved here.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.23%. Comparing base (65b1058) to head (d761b2e).
Report is 24 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1369      +/-   ##
===========================================
- Coverage    94.23%   94.23%   -0.01%     
===========================================
  Files         1068     1070       +2     
  Lines        39348    39412      +64     
===========================================
+ Hits         37080    37140      +60     
- Misses        2268     2272       +4     

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