Make Date header parsing locale-independent

[diachenko-mischa]

Use boost::date_time to ensure cross platform compatibility.
Supersedes the b877dc4

Relates-To: HERESUP-57013

[codecov]

Codecov Report

❌ Patch coverage is 45.45455% with 18 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.24%. Comparing base (c08da4f) to head (4863a44).

Files with missing lines	Patch %	Lines
...k-authentication/src/AuthenticationClientUtils.cpp	45.45%	11 Missing and 7 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1667      +/-   ##
==========================================
- Coverage   80.33%   80.24%   -0.09%     
==========================================
  Files         350      350              
  Lines       14052    14070      +18     
  Branches     1517     1522       +5     
==========================================
+ Hits        11288    11290       +2     
- Misses       2147     2159      +12     
- Partials      617      621       +4     

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