Refactor finding pybind11

[chapulina]

• Builds on top of Fix Focal on Jenkins #364

Summary

• Move find_package call to top-level CMakeLists together with other dependencies
• Print status messages if found / not found for debugging

The change in src/python_pybind11/CMakeLists.txt is mainly whitespace.

Checklist

• Signed all commits for DCO
• Added tests
• Updated documentation (as needed)
• Updated migration guide (as needed)
• codecheck passed (See contributing)
• All tests passed (See test coverage)
• While waiting for a review on your PR, please help review another open pull request to support the maintainers

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[codecov]

Codecov Report

Merging #360 (42be2fa) into chapulina/6/focal_dep (075b962) will not change coverage.
The diff coverage is n/a.

❗ Current head 42be2fa differs from pull request most recent head d4bafe6. Consider uploading reports for the commit d4bafe6 to get more accurate results

@@                  Coverage Diff                   @@
##           chapulina/6/focal_dep     #360   +/-   ##
======================================================
  Coverage                  99.65%   99.65%           
======================================================
  Files                         67       67           
  Lines                       6380     6380           
======================================================
  Hits                        6358     6358           
  Misses                        22       22           

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[j-rivero]

I think we have a missing dep in Jenkins, I'm looking into it.

[chapulina]

The ign-math6 branch is failing too since we moved to Focal on Jenkins:

https://build.osrfoundation.org/job/ignition_math-ci-ign-math6-focal-amd64/1/console

[chapulina]

The ign-math6 branch is failing too since we moved to Focal on Jenkins:

This PR should fix it

[chapulina]

I broke off the Focal fix into #364 for easier review.

[osrf-triage]

This pull request has been mentioned on Gazebo Community. There might be relevant details there:

https://community.gazebosim.org/t/new-ignition-releases-2022-03-01-citadel-edifice-fortress/1313/1