Update CI integration docs for new SSL verification setting

Summary

This is a follow-up to https://gitlab.com/gitlab-org/security/gitlab/-/merge_requests/2043, where we added a new "Enable SSL verification" setting on some CI integrations.

This should also be documented on:

• https://gitlab.com/gitlab-org/gitlab/blob/master/doc/user/project/integrations/bamboo.md
• https://gitlab.com/gitlab-org/gitlab/blob/master/doc/integration/jenkins.md

Links

Similar docs for webhooks: https://gitlab.com/gitlab-org/gitlab/-/blob/master/doc/user/project/integrations/webhooks.md#verify-an-ssl-certificate