feat(opentelemetry): support OpenTelemetry v1.28.0

[colinmoy]

No description provided.

[gemini-code-assist]

Code Review

This pull request upgrades the opentelemetry-cpp dependency to version 1.28.0 across Bazel configurations, Dockerfiles, and documentation. However, the review identified a major regression where a large portion of doc/packaging.md (including the introduction, macOS instructions, and footnotes) was accidentally deleted. Additionally, the changes in grpc_opentelemetry.cc and its test file introduce commented-out code as inline annotations; these should be replaced with clean, raw string literals, and sc::rpc::kRpcMethod should be updated to "rpc.method" for consistency.

[dbolduc]

I think we lost some of doc/packaging.md, but otherwise LG

[dbolduc]

restore this?

[dbolduc]

and this.

[scotthart]

Other than the dockerfiles I called out to update to v1.28.0, let's revert the others to their current values.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.25%. Comparing base (ea49720) to head (29c8f45).
⚠️ Report is 9 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #16453      +/-   ##
==========================================
- Coverage   92.28%   92.25%   -0.04%     
==========================================
  Files        2246     2246              
  Lines      212913   212913              
==========================================
- Hits       196497   196420      -77     
- Misses      16416    16493      +77     

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