fix retry policy

[gormal]

Motivation

Fixes #211 Improve overall default retry policy. It only worked for responses from MAPI, but it did not take into account that an exception can be thrown.

Checklist

• [ ] Code follows coding conventions held in this repo
• [ ] Automated tests have been added
• [ ] Tests are passing
• [ ] Docs have been updated (if applicable)
• [ ] Temporary settings (e.g. variables used during development and testing) have been reverted to defaults

How to test

Unit tests added.

[codecov-commenter]

Codecov Report

Merging #213 (6daea80) into master (76b66e4) will decrease coverage by 0.07%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #213      +/-   ##
==========================================
- Coverage   81.06%   80.99%   -0.07%     
==========================================
  Files         231      231              
  Lines        2640     2631       -9     
  Branches      297      296       -1     
==========================================
- Hits         2140     2131       -9     
  Misses        386      386              
  Partials      114      114              

Impacted Files	Coverage Δ
...nt.Ai.Management/Exceptions/ManagementException.cs	100.00% <100.00%> (ø)
...agement/Modules/HttpClient/ManagementHttpClient.cs	77.55% <100.00%> (-0.45%)	:arrow_down:
...esiliencePolicy/DefaultResiliencePolicyProvider.cs	100.00% <100.00%> (ø)

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