update telemetry exporter to v0.1.1

[vepatel]

Proposed changes

• Update telemetry exporter and remove code as header is now added in exporter itself, related: Add missing GRPC header telemetry-exporter#41 and https://github.com/nginxinc/telemetry-exporter/releases/tag/v0.1.1

Checklist

Before creating a PR, run through this checklist and mark each as complete.

• I have read the CONTRIBUTING doc
• I have added tests that prove my fix is effective or that my feature works
• I have checked that all unit tests pass after adding my changes
• I have updated necessary documentation
• I have rebased my branch onto main
• I will ensure my PR is targeting the main branch and pulling from my branch from my own fork

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 45.58%. Comparing base (d3f49a3) to head (b181e87).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6195      +/-   ##
==========================================
+ Coverage   43.26%   45.58%   +2.31%     
==========================================
  Files         142      142              
  Lines       19970    18961    -1009     
==========================================
+ Hits         8641     8644       +3     
+ Misses      10882     9868    -1014     
- Partials      447      449       +2     

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