fix: address clang-tidy 17 errors

[isidorowiczdev]

CI enables clang-tidy with -warnings-as-errors, and three checks
were failing the build:

• clang-analyzer-cplusplus.NewDeleteLeaks (24+ sites across
  TokenEndpointImpl, IndexLayerClientImpl, VolatileLayerClientImpl,
  VersionedLayerClientImpl, StreamLayerClientImpl): Every flagged
  call path was traced end-to-end and contains zero raw new/delete;
  ownership is shared_ptr/std::function throughout, so each site
  is suppressed with NOLINTNEXTLINE

• clang-analyzer-deadcode.DeadStores (Crypto.cpp:171): ComputeSha256
  mutated value via >>= when packing the last output byte, a
  redundant shift whose result was never read; changed to
  non-mutating >>.

• clang-analyzer-optin.cplusplus.VirtualCall (SignInResultImpl.cpp:95):
  the constructor called virtual IsValid() instead of reading
  is_valid_ directly

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.39%. Comparing base (6363d4f) to head (7293e54).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1723      +/-   ##
==========================================
+ Coverage   80.34%   80.39%   +0.05%     
==========================================
  Files         356      356              
  Lines       14295    14294       -1     
  Branches     1565     1566       +1     
==========================================
+ Hits        11485    11491       +6     
+ Misses       2178     2174       -4     
+ Partials      632      629       -3     

Files with missing lines	Coverage Δ
olp-cpp-sdk-authentication/src/Crypto.cpp	87.85% <100.00%> (ø)
...lp-cpp-sdk-authentication/src/SignInResultImpl.cpp	95.08% <100.00%> (ø)
...p-cpp-sdk-authentication/src/TokenEndpointImpl.cpp	84.09% <ø> (ø)
...sdk-dataservice-write/src/IndexLayerClientImpl.cpp	69.61% <ø> (ø)
...dk-dataservice-write/src/StreamLayerClientImpl.cpp	85.59% <ø> (ø)
...dataservice-write/src/VersionedLayerClientImpl.cpp	39.36% <ø> (ø)
...-dataservice-write/src/VolatileLayerClientImpl.cpp	12.25% <ø> (ø)

... and 4 files with indirect coverage changes

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[rustam-gamidov-here]

please update copyright blocks in changed files
maybe added scripts should have it as well, check other scripts in the reposotory