fix: otelgrpc.UnaryClientInterceptor memory leak

[gaius-qi]

Description

Fix refer to PR argoproj/argo-cd#15174, See open-telemetry/opentelemetry-go-contrib#4226 for more information.

Related Issue

Motivation and Context

Screenshots (if appropriate)

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation Update (if none of the other choices apply)

Checklist

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.

[codecov]

Codecov Report

Merging #2772 (971e07f) into main (a3f2aae) will decrease coverage by 0.11%.
Report is 8 commits behind head on main.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main    #2772      +/-   ##
==========================================
- Coverage   52.45%   52.34%   -0.11%     
==========================================
  Files         157      157              
  Lines       21235    21248      +13     
==========================================
- Hits        11138    11123      -15     
- Misses       9450     9479      +29     
+ Partials      647      646       -1     

Flag	Coverage Δ
Object-compatibility-e2etests	?
e2etests	?
unittests	52.34% <0.00%> (-0.11%)	⬇️

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

Files	Coverage Δ
pkg/rpc/interceptor.go	0.00% <0.00%> (ø)

... and 4 files with indirect coverage changes

[jim3ma]

LGTM