Remove zipkin example

[pradhyum6144]

Removes the deprecated zipkin example following the deprecation of the Zipkin exporter in v1.40.0.

Fixes #8484

Changes

• Removed examples/zipkin/ directory and all its files (Dockerfile, README.md, docker-compose.yml, go.mod, go.sum, main.go)
• Updated versions.yaml to remove zipkin example reference
• Updated .gitignore to remove zipkin binary reference

Verification

• Build verification: Passed
• No remaining references to zipkin example found in codebase
• Total changes: 8 files, 204 deletions

[pradhyum6144]

@MrAlias can you please review this. Thank you.

[MrAlias]

Overall, this looks good. Thanks for the contribution.

Please add a changelog entry for the removal of this module.

[pradhyum6144]

Overall, this looks good. Thanks for the contribution.

Please add a changelog entry for the removal of this module.

okay sir i have added the changelog entry. now this pr is ready to review/merge.
Thank you

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.2%. Comparing base (82cfc18) to head (9e67535).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #8501   +/-   ##
=====================================
  Coverage   82.2%   82.2%           
=====================================
  Files        179     179           
  Lines      13692   13692           
=====================================
  Hits       11257   11257           
  Misses      2033    2033           
  Partials     402     402           

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