feat: Allow anonymous links in event description

[iamareebjamal]

Fixes fossasia/open-event-frontend#5178

[codecov]

Codecov Report

Merging #7299 into development will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@               Coverage Diff               @@
##           development    #7299      +/-   ##
===============================================
+ Coverage        63.93%   63.94%   +0.01%     
===============================================
  Files              259      259              
  Lines            13033    13034       +1     
===============================================
+ Hits              8332     8335       +3     
+ Misses            4701     4699       -2     

Impacted Files	Coverage Δ
app/models/event.py	78.34% <100.00%> (+0.10%)	⬆️
app/models/helpers/versioning.py	96.42% <0.00%> (+7.14%)	⬆️

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