IAM 1375 - removing excess Wiki group references from IAM

[gcoxmoz]

• [x] All PRs are assigned to the review team automatically.
• [ ] New integrations: Legal and Security reviews confirmed. authorized_groups and Auth0 client_id are defined. If display: true, the logo's image is attached. Auth0 app's Connections enables LDAP only.

Combo PR:

• [x] remove securitywiki.allizom.org, not in DNS.
• [x] remove intranet.mozilla.org and intranet.allizom.org, not in DNS.
• [x] remove mana.mozilla.org (only in DNS as a redirect to confluence) andmana.allizom.org` (not in DNS)
• [x] remove GuestWiki from being used on Confluence (a useless group)

This is in service of removing *Wiki LDAP groups. A pedantic check would notice I did not remove IntranetWiki from Confluence; that takes more work and isn't ready to go, but this is the low-hanging fruit.

[ctbfourone]

Mentioned apps removed from Auth0 as well