Change copy constructor to default in TokenResult

[meravingen123]

• Change copy constructor to default in TokenResult because it
  was the same.
• Fixed functional tests for AutoRefreshingToken.

Resolves: OLPEDGE-1494, OLPEDGE-837

Signed-off-by: Serhii Lozynskyi ext-serhii.lozynskyi@here.com

[codecov]

Codecov Report

Merging #611 into master will increase coverage by <.1%.
The diff coverage is 100%.

@@           Coverage Diff            @@
##           master    #611     +/-   ##
========================================
+ Coverage    77.4%   77.5%   +<.1%     
========================================
  Files         277     277             
  Lines        8763    8758      -5     
========================================
+ Hits         6789    6792      +3     
+ Misses       1974    1966      -8

Impacted Files	Coverage Δ
olp-cpp-sdk-authentication/src/TokenResult.cpp	73.3% <ø> (-6.7%)	⬇️
...ntication/include/olp/authentication/TokenResult.h	100% <ø> (ø)	⬆️
...lp-cpp-sdk-authentication/src/SignInResultImpl.cpp	88.7% <100%> (ø)	⬆️
...k-dataservice-read/src/generated/api/StreamApi.cpp	49.3% <0%> (+5.3%)	⬆️
...cpp-sdk-dataservice-read/src/StreamLayerClient.cpp	75% <0%> (+25%)	⬆️

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