This change adds additional checks for the symbols file:
- if a line with a method name gets changed, the package version number
in that line also needs to be updated
- for major API changes (methods renamed or removed) the API version
numbers needs to be incremented
- the API version numbers in the .symbols file and in `CORE_API_VERSION.md`
need to match
This enhances the packaging GHA to be able to verify the renamed
core library. Since the GHA packaging build always uses the action
definition from `master` this change has to land before we can
successfully build the PR that does the actual renaming of the core
library and Debian package. Later we can remove the references to
`libkmnkbp0-0` again.
Part of #9733.
