🕐 Tock: Remove Fortress deprecations

[chapulina]

Summary

Remove functionality that's deprecated since Fortress.

The bulk of it is related to the 3D scene and the ECM.

You can try loading the deprecated world, which asks for GzScene3D, and verify that it loads MinimalScene and other plugins instead:

gz sim -v 2 deprecated_ignition.sdf

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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Addressed

[mjcarroll]

Has a small lint issue.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (gz-sim7@3f57c77). Click here to learn what that means.
The diff coverage is n/a.

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