Add clang 16 toolchain to linux workers.

[briantting]

Resolves Buildbot failures for 24 lts builders that have not migrated to clang 17.

b/332306066

[niranjanyardi]

Original change affected 7 files: #2680

I'm not sure if this single file change will fix issues.

Maybe it needs to hit all the dockerfiles in #2680

[niranjanyardi]

ahh seems like my previous comment was lost. As long as you are hitting all dockerfiles in original change that should be good. #2680

Also maybe add a TODO saying something like : // TODO(b/xxx) - Remove clang 16 once per branch dockerfiles are implemented correctly

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 59.82%. Comparing base (96283a0) to head (23defd2).
Report is 2 commits behind head on main.

❗ Current head 23defd2 differs from pull request most recent head a142c8f. Consider uploading reports for the commit a142c8f to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2794      +/-   ##
==========================================
- Coverage   59.84%   59.82%   -0.02%     
==========================================
  Files        1839     1839              
  Lines       88460    88460              
==========================================
- Hits        52937    52925      -12     
- Misses      35523    35535      +12     

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