gz-math7 7.5.1 debbuilders fail due to missing python files

[azeey]

Failing build; https://build.osrfoundation.org/job/gz-math7-debbuilder/1759/

   debian/rules override_dh_install
make[1]: Entering directory '/home/jenkins/workspace/gz-math7-debbuilder/build/gz-math-7.5.2'
dh_install
dh_install: warning: Cannot find (any matches for) "usr/lib/python3/dist-packages/*" (tried in ., debian/tmp)

dh_install: warning: python3-gz-math7 missing files: usr/lib/python3/dist-packages/*
dh_install: error: missing files, aborting
make[1]: *** [debian/rules:26: override_dh_install] Error 255
make[1]: Leaving directory '/home/jenkins/workspace/gz-math7-debbuilder/build/gz-math-7.5.2'

The error points to missing python files. I suspect this is related to #640

[scpeters]

I think our gz-math7 CI builds are also failing to find python. We should port gazebosim/gz-transport#565 to other packages and branches to clarify when we are failing to find python

in terms of the underlying reason, I believe we need to backport the logic changes to GzBuildTests.cmake and GzCodeCheck.cmake from gazebosim/gz-cmake#431 to gz-cmake3

[scpeters]

I think our gz-math7 CI builds are also failing to find python. We should port gazebosim/gz-transport#565 to other packages and branches to clarify when we are failing to find python

porting to gz-math8 in #662

we should backport that to gz-math7 as well, but there will be conflicts that must be resolved manually

[scpeters]

porting to gz-math8 in #662

we should backport that to gz-math7 as well, but there will be conflicts that must be resolved manually

backporting to gz-math7 in #663