refactor!: remove old schematics

[splincode]

PR Checklist

Please check if your PR fulfills the following requirements:

• [x] The commit message follows Conventional Commits
• [ ] Tests for the changes have been added (for bug fixes / features)
• [ ] Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• [ ] Bugfix
• [ ] Feature
• [x] Refactoring
• [ ] Code style update
• [ ] Build or CI related changes
• [ ] Documentation content changes

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[codecov[bot]]

Codecov Report

:exclamation: No coverage uploaded for pull request base (v3.x@e854957). Click here to learn what that means. The diff coverage is n/a.

@@           Coverage Diff           @@
##             v3.x    #2341   +/-   ##
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