[Brent] Check for 3rd contamination event.

[dracos]

For FD-3672
Given info was: "With regards to your contamination events you would need to look for any properties that have had a 3rd, 4th or 5th contamination in the last X months. Use the GetEvents call with EventIDs: 2923, 2924 and 2925."
Am only checking for 3rd, as presumably that means they've had 3, so no need to check 4th/5th.
[skip changelog]

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.66%. Comparing base (2460d7d) to head (8e9339f).
Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5115   +/-   ##
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  Coverage   82.66%   82.66%           
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  Files         404      404           
  Lines       31462    31462           
  Branches     4988     4988           
=======================================
  Hits        26008    26008           
- Misses       3975     3976    +1     
+ Partials     1479     1478    -1     

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[MorayMySoc]

Looks good to me