Expand list of Event types

[mattreduce]

Proposed changes

• Alphabetize the list of Event types
• Add these types of events relevant for intelligence:
  • conference to cover conferences/symposia/large meetings that aren't international summits
  • financial can mean an IPO, merger, acquisition, earnings report, or other significant financial event
  • holiday could mean a holiday like Independence Day in the United States, a day when work or school are closed (which could correlate with attacker activity), or a day of religious or national significance to incorporate into analysis

Checklist

• I consider the submitted work as finished
• I tested the code for its functionality
• I wrote test cases for the relevant uses case
• I added/update the relevant documentation (either on github or on notion)
• Where necessary I refactored code to improve the overall quality

Further comments

Thank you! Let me know if you have any questions, or if I should take this opportunity to add other types of Events.

[codecov]

Codecov Report

Base: 71.72% // Head: 71.74% // Increases project coverage by +0.01% 🎉

Coverage data is based on head (ff455b8) compared to base (b919888).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2393      +/-   ##
==========================================
+ Coverage   71.72%   71.74%   +0.01%     
==========================================
  Files         236      236              
  Lines       15064    15064              
  Branches     2439     2439              
==========================================
+ Hits        10805    10807       +2     
+ Misses       3692     3690       -2     
  Partials      567      567              

Impacted Files	Coverage Δ
...tform/opencti-graphql/src/graphql/sseMiddleware.js	61.24% <0.00%> (+0.42%)	⬆️

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[SamuelHassine]

Thanks a lot @mattreduce for this PR!