Deb: Use --fail-missing and ensure the not-installed list is up-to-date
Make the Debian build fail if it detects that the build (CMake) created
files that are not used in any package nor accounted in the special
not-installed file.
Stop creating symbolic links in Debian packaging for files that the CMake
build already created.
Document known cases of files that are intentionally not installed.
Leave the rest in the not-installed list for visibility. The list can
later be trimmed down and having the --fail-missing will prevent any new
unaccounted files from being introduced.
Note that despite extensive refactoring in the Debian packaging files,
there was no changes in the packages produced as verified by package
files lists before and after.
Deb: Finalize the version less Debian package transition
In addition to the binary .deb packages, also remove the version
string from the Debian source package.
Also clean away excess use of __MARIADB_MAJOR_VER__ constant
and add inline note that the whole debian-XX.X.flag file thing
should be removed and replaced by using the new MariaDB server
mysql_upgrade_info file.
Deb: Remove from Salsa-CI buster-backports as it does not have libfmt 7+
Switch to using bullseye-backports where buster-backports was used or
remove steps that only worked on buster-backports. For example the
Percona XtraDB Cluster 5.7 was available up until Buster but no longer
in Bullseye, so remove it.
Also revert 4d03269425dfd3824fce8c8d46c3b71166f25baa that was done in vain.
For the sake of CI we do want to have working upgrades from previous 10.9
releases and it is doable with another kind of fix in a later commit.