[Code health] Include what you use cleanup, part 5

[marcalff]

Contributes to #2054

Changes

Please provide a brief description of the changes here.

• continued the include-what-you-use cleanup
• total number of warnings decreased from 37 in branch main, to 2 in this PR.
• CI is now enforcing a pass/fail check, with some tolerance (<= 10 warnings)

Note that the cleanup is not completed, as some optional parts (OTLP GRPC) are not covered yet by the build in CI. This will be handled in subsequent PRs.

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

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 87.86%. Comparing base (2a8c8bc) to head (4bfb381).

Additional details and impacted files

[](https://app.codecov.io/gh/open-telemetry/opentelemetry-cpp/pull/3140?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=open-telemetry) ```diff @@ Coverage Diff @@ ## main #3140 +/- ## ======================================= Coverage 87.86% 87.86% ======================================= Files 195 195 Lines 6151 6151 ======================================= Hits 5404 5404 Misses 747 747 ``` | [Files with missing lines](https://app.codecov.io/gh/open-telemetry/opentelemetry-cpp/pull/3140?dropdown=coverage&src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=open-telemetry) | Coverage Δ | | |---|---|---| | 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[marcalff]

@open-telemetry/cpp-contrib-approvers Ready for review.

[marcalff]

@ThomsonTan @lalitb @esigo @owent

Any chance to approve this cleanup, so it goes into release 1.18.0 ?