Skip main.ssl_autoverify test in GitLab-CI

See comments by dlenski@ on https://jira.mariadb.org/browse/MDEV-31855;
almost everything about the "feature" AND the test are irredeemably wrong,
and open new security holes.

Changes in the `libmariadb` submodule in this server branch prevent the test
from "passing"; the fact that the test "passes" does not indicate that its
behavior is secure, safe, or correct.

All new code of the whole pull request, including one or several files
that are either new files or modified ones, are contributed under the
BSD-new license. I am contributing on behalf of my employer Amazon Web
Services, Inc.

.gitlab-ci.yml

@@ -298,6 +298,7 @@ centos7:
  main.flush_logs_not_windows : query 'flush logs' succeeded - should have failed with error ER_CANT_CREATE_FILE (1004)
  main.mysql_upgrade_noengine : upgrade output order does not match the expected
  main.func_math : MDEV-20966 - Wrong error code
+ main.ssl_autoverify : See comments by dlenski@ on https://jira.mariadb.org/browse/MDEV-31855; almost everything about the "feature" AND the test are wrong
  " > skiplist
  - ./mtr --suite=main --force --parallel=auto --xml-report=$CI_PROJECT_DIR/junit.xml --skip-test-list=skiplist $RESTART_POLICY