Disable latex and class hierarchy generation (backport #1447)

[mergify]

Summary

We don't use the latex output anywhere, but it brings in a big dependency when building documentation or deb packages. The class hierarchy is also not that useful since there is not much inheritance used in the codebase. This also brings the doxygen parameters of sdformat closer to other Gazebo libraries.

Note: I plan to Backport this to all the previous versions of sdformat

Checklist

• Signed all commits for DCO
• Added tests
• Updated documentation (as needed)
• Updated migration guide (as needed)
• Consider updating Python bindings (if the library has them)
• 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

Note to maintainers: Remember to use Squash-Merge and edit the commit message to match the pull request summary while retaining Signed-off-by messages.

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This is an automatic backport of pull request #1447 done by Mergify.

[mergify]

Cherry-pick of 8e7b267 has failed:

On branch mergify/bp/sdf12/pr-1447
Your branch is up to date with 'origin/sdf12'.

You are currently cherry-picking commit 8e7b267b.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   doc/sdf.in

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   doc/CMakeLists.txt

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally