Fix failing EE specs in security release

See merge request gitlab/gitlab-ee!753

[master] Add a shared secret to prevent abuse of the alert endpoint

See merge request gitlab/gitlab-ee!708

Fix #55740:  Use the '--no-document' option instead of the 'gem' tool's deprecated options

Closes #55740

See merge request gitlab-org/gitlab-ce!24049

Fix commit SHA not showing in merge request compare dropdown

Closes #55822

See merge request gitlab-org/gitlab-ce!24084

Upgrade Omniauth and JWT gems to switch away from Google+ API

Closes #55668

See merge request gitlab-org/gitlab-ce!24068

Handle JIRA links with encoded namespace

Closes #8054

See merge request gitlab-org/gitlab-ee!8908

`--no-rdoc` and `--no-ri` have been deprecated since RubyGems 2.0:
https://github.com/rubygems/rubygems/blob/v2.0.0/History.txt#L43

They were finally removed in a recent release:
https://github.com/rubygems/rubygems/pull/2354