ci: otel_collector updates

[scotthart]

Tidying up some things ahead of a bigger PR.

[gemini-code-assist]

Code Review

This pull request updates the otel_collector tool to use inline namespaces and include the version header, aligning it with the SDK's namespace standards. It also updates the Bazel and CMake build configurations to add the common library dependency and clean up target definitions. The review feedback points out a redundant add_dependencies call in CMakeLists.txt that can be safely removed because the dependency is already established via target_link_libraries.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.30%. Comparing base (f07c472) to head (a9bd631).

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #16284   +/-   ##
=======================================
  Coverage   92.30%   92.30%           
=======================================
  Files        2223     2223           
  Lines      207876   207876           
=======================================
+ Hits       191880   191881    +1     
+ Misses      15996    15995    -1     

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.