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: itssaharsh / name: Saharsh Tibrewala (54f7cf4, 9367fb8, c3ebde9, fe2bf8a)

[codecov]

Codecov Report

❌ Patch coverage is 93.93939% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 81.7%. Comparing base (d45961b) to head (c3ebde9).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
...log/otlploggrpc/internal/observ/instrumentation.go	93.9%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #7824   +/-   ##
=====================================
  Coverage   81.6%   81.7%           
=====================================
  Files        304     304           
  Lines      23240   23245    +5     
=====================================
+ Hits       18986   19001   +15     
+ Misses      3864    3856    -8     
+ Partials     390     388    -2     

Files with missing lines	Coverage Δ
...log/otlploggrpc/internal/observ/instrumentation.go	94.6% <93.9%> (-4.7%)	⬇️

... and 3 files with indirect coverage changes

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