[v4.2.0-rhel] CI: Remove F35 and Ubuntu

This release branch is tracking RHEL 8.6/9.0 and therefore has no need
to execute any CI testing on F35/Ubuntu.  Worse, going forward these
releases contain golang versions incompatible with future CVE backports.
Remove them.

Signed-off-by: Chris Evich <cevich@redhat.com>

.cirrus.yml

@@ -27,8 +27,6 @@ env:
     #### Cache-image names to test with (double-quotes around names are critical)
     ####
     FEDORA_NAME: "fedora-36"
-    PRIOR_FEDORA_NAME: "fedora-35"
-    UBUNTU_NAME: "ubuntu-2110"
 
     # Image identifiers
     IMAGE_SUFFIX: "c6211193021923328"
@@ -36,12 +34,8 @@ env:
     FEDORA_AMI: "ami-06a41d8a81ab56afa"
     # GCP Images
     FEDORA_CACHE_IMAGE_NAME: "fedora-${IMAGE_SUFFIX}"
-    PRIOR_FEDORA_CACHE_IMAGE_NAME: "prior-fedora-${IMAGE_SUFFIX}"
-    UBUNTU_CACHE_IMAGE_NAME: "ubuntu-${IMAGE_SUFFIX}"
     # Container FQIN's
     FEDORA_CONTAINER_FQIN: "quay.io/libpod/fedora_podman:${IMAGE_SUFFIX}"
-    PRIOR_FEDORA_CONTAINER_FQIN: "quay.io/libpod/prior-fedora_podman:${IMAGE_SUFFIX}"
-    UBUNTU_CONTAINER_FQIN: "quay.io/libpod/ubuntu_podman:${IMAGE_SUFFIX}"
 
     ####
     #### Control variables that determine what to run and how to run it.
@@ -168,17 +162,6 @@ build_task:
               CTR_FQIN: ${FEDORA_CONTAINER_FQIN}
               # ID for re-use of build output
               CI_DESIRED_RUNTIME: crun
-        - env: &priorfedora_envvars
-              DISTRO_NV: ${PRIOR_FEDORA_NAME}
-              VM_IMAGE_NAME: ${PRIOR_FEDORA_CACHE_IMAGE_NAME}
-              CTR_FQIN: ${PRIOR_FEDORA_CONTAINER_FQIN}
-              CI_DESIRED_RUNTIME: crun
-        - env: &ubuntu_envvars
-              DISTRO_NV: ${UBUNTU_NAME}
-              VM_IMAGE_NAME: ${UBUNTU_CACHE_IMAGE_NAME}
-              CTR_FQIN: ${UBUNTU_CONTAINER_FQIN}
-              # FIXME 2022-07-12: change to runc once #14833 is fixed!
-              CI_DESIRED_RUNTIME: crun
     env:
         TEST_FLAVOR: build
     clone_script: *full_clone
@@ -427,8 +410,6 @@ unit_test_task:
         - validate
     matrix:
         - env: *stdenvars
-        - env: *priorfedora_envvars
-        - env: *ubuntu_envvars
         # Special-case: Rootless on latest Fedora (standard) VM
         - name: "Rootless unit on $DISTRO_NV"
           env:
@@ -554,11 +535,6 @@ container_integration_test_task:
               _BUILD_CACHE_HANDLE: ${FEDORA_NAME}-build-${CIRRUS_BUILD_ID}
               VM_IMAGE_NAME: ${FEDORA_CACHE_IMAGE_NAME}
               CTR_FQIN: ${FEDORA_CONTAINER_FQIN}
-        - env:
-              DISTRO_NV: ${PRIOR_FEDORA_NAME}
-              _BUILD_CACHE_HANDLE: ${PRIOR_FEDORA_NAME}-build-${CIRRUS_BUILD_ID}
-              VM_IMAGE_NAME: ${PRIOR_FEDORA_CACHE_IMAGE_NAME}
-              CTR_FQIN: ${PRIOR_FEDORA_CONTAINER_FQIN}
     gce_instance: *standardvm
     timeout_in: 90m
     env:
@@ -774,8 +750,6 @@ meta_task:
         # Space-separated list of images used by this repository state
         IMGNAMES: >-
             ${FEDORA_CACHE_IMAGE_NAME}
-            ${PRIOR_FEDORA_CACHE_IMAGE_NAME}
-            ${UBUNTU_CACHE_IMAGE_NAME}
             build-push-${IMAGE_SUFFIX}
         EC2IMGNAMES: ${FEDORA_AMI}
         BUILDID: "${CIRRUS_BUILD_ID}"