Drop RaspberryPi OS Buster builds

RaspberryPi OS Buster builds were announced to be removed in 17.8.

Closes https://gitlab.com/gitlab-org/omnibus-gitlab/-/issues/8821

Changelog: removed

gitlab-ci-config/check-packages.yml

@@ -102,14 +102,6 @@ Debian-12-check:
 Debian-12-arm64-check:
   image: "${BUILDER_IMAGE_REGISTRY}/debian_12_arm64:latest"
   extends: .apt-arm-install
-Raspberry-Pi-2-Buster-check:
-  image: "${BUILDER_IMAGE_REGISTRY}/rpi_10:latest"
-  extends: .apt-install
-  rules:
-    - if: '$PIPELINE_TYPE == "CE_CHECK_PACKAGE_AVAILABILITY_PIPELINE"'
-  variables:
-    package_repository: 'raspberry-pi2'
-  tags: !reference [.distribution-armhf-tags]
 Raspberry-Pi-2-Bullseye-check:
   image: "${BUILDER_IMAGE_REGISTRY}/rpi_11:latest"
   extends: .apt-install

gitlab-ci-config/dev-gitlab-org.yml

@@ -471,10 +471,6 @@ QA-branch:
     - !reference [.default_rules, rules]
     - if: '$PIPELINE_TYPE =~ /_(NIGHTLY|BRANCH)_BUILD_PIPELINE$/'
-Raspberry-Pi-2-Buster-branch:
-  image: "${BUILDER_IMAGE_REGISTRY}/rpi_10:${BUILDER_IMAGE_REVISION}"
-  extends: .rpi_branch_template
-
 Raspberry-Pi-2-Bullseye-branch:
   image: "${BUILDER_IMAGE_REGISTRY}/rpi_11:${BUILDER_IMAGE_REVISION}"
   extends: .rpi_branch_template
@@ -1120,10 +1116,6 @@ manifest-upload:
     - if: '$PIPELINE_TYPE =~ /_(RC|TAG)_BUILD_PIPELINE$/'
       when: manual
-Raspberry-Pi-2-Buster:
-  extends: .rpi_tag_template
-  image: "${BUILDER_IMAGE_REGISTRY}/rpi_10:${BUILDER_IMAGE_REVISION}"
-
 Raspberry-Pi-2-Bullseye:
   extends: .rpi_tag_template
   image: "${BUILDER_IMAGE_REGISTRY}/rpi_11:${BUILDER_IMAGE_REVISION}"
@@ -1132,11 +1124,6 @@ Raspberry-Pi-2-Bookworm:
   extends: .rpi_tag_template
   image: "${BUILDER_IMAGE_REGISTRY}/rpi_12:${BUILDER_IMAGE_REVISION}"
-Raspberry-Pi-2-Buster-release:
-  extends: .raspbian_release_template
-  needs:
-    - Raspberry-Pi-2-Buster
-
 Raspberry-Pi-2-Bullseye-release:
   extends: .raspbian_release_template
   needs: