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.

debian/salsa-ci.yml

@@ -51,22 +51,6 @@ build bullseye-backports:
   variables:
     RELEASE: bullseye-backports
 
-build buster-backports:
-  extends: .build-package
-  script:
-    # Force installation of liburing-dev from buster-backports
-    - apt-get update && apt-cache policy && eatmydata apt-get install liburing-dev
-    # Increase default backports priority policy from '100' to '500' so it can actually be used
-    - |
-      cat << EOF > /etc/apt/preferences.d/enable-backports-to-satisfy-dependencies
-      Package: *
-      Pin: release n=buster-*
-      Pin-Priority: 500
-      EOF
-    - *autobake-deb-steps
-  variables:
-    RELEASE: buster-backports
-
 # base image missing git
 build i386:
   extends: .build-package
@@ -524,11 +508,11 @@ mysql-8.0 Sid to mariadb upgrade:
 
 # Upgrading from MySQL 8.0 with datadir in place is not possible. Users need to do a data dump.
 # The Debian maintainer scripts detect this situation and simply moves old datadir aside and start fresh.
-mysql-8.0 Focal to mariadb upgrade:
+mysql-8.0 Jammy to mariadb upgrade:
   stage: upgrade extras
   needs:
-    - job: build buster-backports
-  image: debian:buster
+    - job: build bullseye-backports
+  image: debian:bullseye
   artifacts:
     when: always
     name: "$CI_BUILD_NAME"
@@ -546,7 +530,7 @@ mysql-8.0 Focal to mariadb upgrade:
     - sleep 10 && apt-get install -f
     - *test-verify-initial
     # Enable backports to make galera-4 available
-    - echo "deb http://deb.debian.org/debian buster-backports main" > /etc/apt/sources.list.d/backports.list && apt-get update
+    - echo "deb http://deb.debian.org/debian bullseye-backports main" > /etc/apt/sources.list.d/backports.list && apt-get update
     - *test-install
     - service mysql status
     - sleep 5 # Give the mysql_upgrade a bit of time to complete before querying the server
@@ -773,8 +757,8 @@ mariadb.org-10.2 to mariadb upgrade:
 mysql.com-5.7 to mariadb upgrade:
   stage: upgrade extras
   needs:
-    - job: build buster-backports
-  image: debian:buster
+    - job: build bullseye-backports
+  image: debian:bullseye
   artifacts:
     when: always
     name: "$CI_BUILD_NAME"
@@ -785,44 +769,12 @@ mysql.com-5.7 to mariadb upgrade:
     - |
       apt-get install --no-install-recommends --yes gpg gpg-agent dirmngr ca-certificates # Bare minimal (<4MB) for apt-key to work
       apt-key adv --recv-keys --keyserver hkps://keyserver.ubuntu.com:443 467B942D3A79BD29
-      echo "deb https://repo.mysql.com/apt/debian/ buster mysql-5.7" > /etc/apt/sources.list.d/mysql.list
+      echo "deb https://repo.mysql.com/apt/debian/ bullseye mysql-5.7" > /etc/apt/sources.list.d/mysql.list
       apt-get update
       apt-get install -y 'mysql*' 'libmysqlc*'
     - *test-verify-initial
     # Enable backports to make galera-4 available
-    - echo "deb http://deb.debian.org/debian buster-backports main" >> /etc/apt/sources.list.d/backports.list && apt-get update
-    - *test-install
-    - service mysql status
-    - sleep 15 # Give the mysql_upgrade a bit of extra time to complete with MySQL 5.7 before querying the server
-    - *test-verify-final
-  variables:
-    GIT_STRATEGY: none
-  except:
-    variables:
-      - $CI_COMMIT_TAG != null && $SALSA_CI_ENABLE_PIPELINE_ON_TAGS !~ /^(1|yes|true)$/
-
-percona-xtradb-5.7 to mariadb upgrade (MDEV-22679):
-  stage: upgrade extras
-  needs:
-    - job: build buster-backports
-  image: debian:buster
-  artifacts:
-    when: always
-    name: "$CI_BUILD_NAME"
-    paths:
-      - ${WORKING_DIR}/debug
-  script:
-    - *test-prepare-container
-    - |
-      apt-get install --no-install-recommends --yes gpg gpg-agent dirmngr ca-certificates # Bare minimal (<4MB) for apt-key to work
-      apt-key adv --recv-keys --keyserver hkps://keyserver.ubuntu.com:443 9334A25F8507EFA5
-      echo "deb https://repo.percona.com/apt/ buster main" > /etc/apt/sources.list.d/mysql.list
-      apt-get update
-      apt-get install -y percona-xtradb-cluster-full-57 percona-xtrabackup-24 percona-toolkit pmm2-client
-    - service mysql status
-    - *test-verify-initial
-    # Enable backports to make galera-4 available
-    - echo "deb http://deb.debian.org/debian buster-backports main" >> /etc/apt/sources.list.d/backports.list && apt-get update
+    - echo "deb http://deb.debian.org/debian bullseye-backports main" >> /etc/apt/sources.list.d/backports.list && apt-get update
     - *test-install
     - service mysql status
     - sleep 15 # Give the mysql_upgrade a bit of extra time to complete with MySQL 5.7 before querying the server