Checked if Instrument Enabled before measuring in otlpgrpc

[itssaharsh]

This pr updates otlploggprc for cecking if the operation is enabled before addinng any metric or performing operation.

tracked in #7800

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: dmathieu / name: Damien Mathieu (2cc238b)

[codecov]

Codecov Report

❌ Patch coverage is 90.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 81.6%. Comparing base (53c10af) to head (2cc238b).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...log/otlploggrpc/internal/observ/instrumentation.go	90.0%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##            main   #7824     +/-   ##
=======================================
- Coverage   81.7%   81.6%   -0.1%     
=======================================
  Files        304     304             
  Lines      23281   23285      +4     
=======================================
- Hits       19021   19013      -8     
- Misses      3866    3867      +1     
- Partials     394     405     +11     

Files with missing lines	Coverage Δ
...log/otlploggrpc/internal/observ/instrumentation.go	90.9% <90.0%> (-8.4%)	⬇️

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Pull request overview

This pull request adds Enabled() checks before metric operations in the otlploggrpc exporter to optimize performance by avoiding computationally expensive operations when metrics are disabled. This is part of the broader effort tracked in issue #7800 to use the Enabled method across all synchronous metric instruments in the project.

Changes:

• Added Enabled() checks before Add() calls on the inflight metric in ExportLogs method
• Added Enabled() checks before metric operations in the End method for inflight, exported, and duration metrics

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