Add email validation and testing for appointments booking

[miaulalala]

No description provided.

[miaulalala]

/backport to stable3.2

[codecov]

Codecov Report

Merging #4073 (de312c9) into main (c4fe96d) will increase coverage by 0.24%.
The diff coverage is n/a.

❗ Current head de312c9 differs from pull request most recent head dc2be81. Consider uploading reports for the commit dc2be81 to get more accurate results

@@             Coverage Diff              @@
##               main    #4073      +/-   ##
============================================
+ Coverage     29.50%   29.75%   +0.24%     
- Complexity      324      325       +1     
============================================
  Files           220      220              
  Lines          7596     7600       +4     
  Branches       1003     1003              
============================================
+ Hits           2241     2261      +20     
+ Misses         5355     5339      -16     

Flag	Coverage Δ
javascript	20.80% <ø> (-0.01%)	⬇️
php	68.83% <ø> (+1.27%)	⬆️

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Impacted Files	Coverage Δ
src/store/calendarObjects.js	0.00% <0.00%> (ø)
...apps/calendar/lib/Controller/BookingController.php	55.55% <0.00%> (+21.07%)	⬆️

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