Drop STI tests inherited from Fedora

They're deprecated in RHEL 10 anyway and mess up with TMT gating
configuration.

Related: RHEL-36636

tests/tests-reboot.yml

@@ -1,50 +0,0 @@
----
-- hosts: localhost
-  vars:
-  - artifacts: "{{ lookup('env', 'TEST_ARTIFACTS')|default('./artifacts', true) }}"
-  tags:
-  - classic
-  tasks:
-  # switch SELinux to permissive mode
-  - name: Get default kernel
-    command: "grubby --default-kernel"
-    register: default_kernel
-  - debug: msg="{{ default_kernel.stdout }}"
-  - name: Set permissive mode
-    command: "grubby --args=enforcing=0 --update-kernel {{ default_kernel.stdout }}"
-
-  - name: reboot
-    block:
-      - name: restart host
-        shell: sleep 2 && shutdown -r now "Ansible updates triggered"
-        async: 1
-        poll: 0
-        ignore_errors: true
-
-      - name: wait for host to come back
-        wait_for_connection:
-          delay: 10
-          timeout: 300
-
-      - name: Re-create /tmp/artifacts
-        command: mkdir /tmp/artifacts
-
-      - name: Gather SELinux denials since boot
-        shell: |
-            result=pass
-            dmesg | grep -i -e type=1300 -e type=1400 > /tmp/avc.log && result=fail
-            ausearch -m avc -m selinux_err -m user_avc -ts boot &>> /tmp/avc.log
-            grep -q '<no matches>' /tmp/avc.log || result=fail
-            echo -e "\nresults:\n- test: reboot and collect AVC\n  result: $result\n  logs:\n  - avc.log\n\n" > /tmp/results.yml
-            ( [ $result = "pass" ] && echo PASS test-reboot || echo FAIL test-reboot ) > /tmp/test.log
-
-    always:
-      - name: Pull out the artifacts
-        fetch:
-          dest: "{{ artifacts }}/"
-          src: "{{ item }}"
-          flat: yes
-        with_items:
-          - /tmp/test.log
-          - /tmp/avc.log
-          - /tmp/results.yml