ENGTAI-40849: Add service.instance.id attribute in SpanFromContext function

[tim-mwangi]

Description

SpanFromContext is used by the otel http and grpc instrumentation. StartSpan already adds service.instance.id attribute. So adding it in SpanFromContext as well

Testing

Manual testing

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.

Project coverage is 53.35%. Comparing base (0dd308a) to head (77a288e).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
instrumentation/opentelemetry/span.go	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #248      +/-   ##
==========================================
- Coverage   61.14%   53.35%   -7.79%     
==========================================
  Files          59       59              
  Lines        2697     2699       +2     
==========================================
- Hits         1649     1440     -209     
- Misses        967     1185     +218     
+ Partials       81       74       -7     

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