ci: drop all remaining 8.4 nightly jobs

RHEL 8.4 is GA for a long time so we no longer need 8.4 nightly jobs.

Signed-off-by: Ondřej Budai <ondrej@budai.cz>

.gitlab-ci.yml

@@ -47,8 +47,6 @@ RPM:
           - aws/centos-stream-8-x86_64
           - aws/centos-stream-8-aarch64
       - RUNNER:
-          - aws/rhel-8.4-x86_64
-          - aws/rhel-8.4-aarch64
           - aws/rhel-8.5-x86_64
           - aws/rhel-8.5-aarch64
           - aws/rhel-9.0-beta-nightly-x86_64
@@ -205,7 +203,6 @@ Integration:
       - SCRIPT:
           - azure_hyperv_gen2.sh
         RUNNER:
-          - aws/rhel-8.4-x86_64
           - aws/rhel-8.5-x86_64
         INTERNAL_NETWORK: ["true"]
       - <<: *INTEGRATION_TESTS