New #868: Add SerializationFailureException

[KalimeroMK]

Fix #868

Adds SerializationFailureException for SQLSTATE code 40001 (serialization failure, e.g. transaction deadlock in concurrent updates). The code is the same for all databases, so the conversion is done centrally in ConvertException, next to the existing IntegrityException mapping.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.62%. Comparing base (f0b0d2b) to head (139b614).

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #1196   +/-   ##
=========================================
  Coverage     98.62%   98.62%           
- Complexity     1645     1646    +1     
=========================================
  Files           120      120           
  Lines          4288     4290    +2     
=========================================
+ Hits           4229     4231    +2     
  Misses           59       59           

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