[backend] feat: reset XTM Hub registration when platform is not found (#4441)

[Kroustille]

Proposed changes

• reset registration data when platform is not found on the hub
• refactor how connectivity lost email is handled

Testing Instructions

1. register platform on the hub
2. remove platform in the hub
3. check that registration is removed after connectivity check

Related issues

• [XTMH] reset registration data when platform is not found in the hub #4441
• Admins of all the staging training l instances get spammed by emails FiligranHQ/xtm-hub#1286

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
• For bug fix -> I implemented a test that covers the bug

Further comments

If this is a relatively large or complex change, kick off the discussion by explaining why you chose the solution you did and what alternatives you considered, etc...

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 50.09%. Comparing base (3dab8a4) to head (404ed9e).

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #4442   +/-   ##
=========================================
  Coverage     50.08%   50.09%           
  Complexity     3622     3622           
=========================================
  Files           888      888           
  Lines         26493    26497    +4     
  Branches       1986     1986           
=========================================
+ Hits          13270    13274    +4     
  Misses        12426    12426           
  Partials        797      797           

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[savacano28]

Maybe you could extract this in a constant : openaev?