Checked if Operation Enabled in otlptracehttp before performing operation

[itssaharsh]

This PR adds the Enabled functionality to checked if the field is enabled before performing computational heavy work.
Tracked in #7800

[codecov]

Codecov Report

❌ Patch coverage is 93.75000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 81.6%. Comparing base (ef61bb4) to head (66eec55).

Files with missing lines	Patch %	Lines
...e/otlptracehttp/internal/observ/instrumentation.go	93.7%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##            main   #7881     +/-   ##
=======================================
- Coverage   81.7%   81.6%   -0.1%     
=======================================
  Files        304     304             
  Lines      23283   23288      +5     
=======================================
- Hits       19028   19025      -3     
- Misses      3868    3869      +1     
- Partials     387     394      +7     

Files with missing lines	Coverage Δ
...e/otlptracehttp/internal/observ/instrumentation.go	95.0% <93.7%> (-5.0%)	⬇️

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