Set OTLP 1.2.0 span parent/link remote flags

[Nevay]

Sets remote flags for Span parent and links.

https://github.com/open-telemetry/opentelemetry-proto/blob/main/CHANGELOG.md#120---2024-03-29

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.00%. Comparing base (f2cba82) to head (b280eff).

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1298      +/-   ##
============================================
+ Coverage     73.97%   74.00%   +0.02%     
- Complexity     2365     2367       +2     
============================================
  Files           347      347              
  Lines          7071     7077       +6     
============================================
+ Hits           5231     5237       +6     
  Misses         1840     1840              

Flag	Coverage Δ
8.1	74.00% <100.00%> (+0.02%)	⬆️
8.2	74.00% <100.00%> (+0.02%)	⬆️
8.3	74.00% <100.00%> (+0.02%)	⬆️
8.4	72.86% <100.00%> (+0.02%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
src/Contrib/Otlp/SpanConverter.php	99.08% <100.00%> (+0.05%)	⬆️

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