[BUILD] upgrade googletest and benchmark to the latest releases supporting C++14

[dbarker]

Contributes to #3525

Upgrade googletest and benchmark to the latest versions that support C++14.

Changes

• upgrade googletest to 1.16.0
• upgrade benchmark to 1.9.0

For significant contributions please make sure you have completed the following items:

• CHANGELOG.md updated for non-trivial changes
• Unit tests have been added
• Changes in public API reviewed

[netlify]

✅ Deploy Preview for opentelemetry-cpp-api-docs canceled.

Name	Link
🔨 Latest commit	7734be9
🔍 Latest deploy log	https://app.netlify.com/projects/opentelemetry-cpp-api-docs/deploys/68aa18be70b24400071ce93e

[dbarker]

CI tests will fail when built with C++14 and the latest versions of googletest (v1.17.0). That upgrade will depend on bumping the minimum C++ version to C++17.

external/googletest~/googletest/include/gtest/internal/gtest-port.h:273:2: error: #error C++ versions less than C++17 are not supported.
  273 | #error C++ versions less than C++17 are not supported.
      |  ^~~~~

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.05%. Comparing base (6bc8349) to head (eb893ee).
⚠️ Report is 32 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3607      +/-   ##
==========================================
- Coverage   90.08%   90.05%   -0.02%     
==========================================
  Files         220      220              
  Lines        7081     7081              
==========================================
- Hits         6378     6376       -2     
- Misses        703      705       +2     

see 2 files with indirect coverage changes

🚀 New features to boost your workflow:

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

[dbarker]

For some reason these changes are triggering the bazel asan test to fail on compilation.

One issue is that the 20250127.0 version of abseil is being pulled in which only supports c++17.

2025/08/23 20:46:19 Downloading https://releases.bazel.build/7.1.1/release/bazel-7.1.1-linux-x86_64...
Starting local Bazel server and connecting to it...
Computing main repo mapping: 
Computing main repo mapping: 
Computing main repo mapping: 
Computing main repo mapping: 
WARNING: For repository 'com_google_absl', the root module requires module version [email protected], but got [email protected] in the resolved dependency graph.
WARNING: For repository 'bazel_skylib', the root module requires module version [email protected], but got [email protected] in the resolved dependency graph.
WARNING: For repository 'com_github_grpc_grpc', the root module requires module version [email protected], but got [email protected] in the resolved dependency graph.
WARNING: For repository 'platforms', the root module requires module version [email protected], but got [email protected] in the resolved dependency graph.
WARNING: For repository 'com_google_protobuf', the root module requires module version [email protected], but got [email protected] in the resolved dependency graph.
WARNING: For repository 'rules_proto', the root module requires module version [email protected], but got [email protected] in the resolved dependency graph.

[dbarker]

Closing in favor of #3685