EL-1238 Part B: Update hostnames and values

[willc-work]

Jira ticket

What changed and why

Swapped the hostname for main from the existing NS to the new NS
Update values files to correspond e.g oauth
Add a wait in circleci to prevent ingress conflicts

Guidance to review

This PR is the 2nd for this ticket. It must not be merged until the redis and postgres DBs have been successfully migrated to the new NS. This merge will take the domain name offline briefly (a few minutes, likely less than 5), so even the maintenance page would not be visible to someone trying to access the site.

Part C: #1065

Checklist

Before you ask people to review this PR:

• Tests and rubocop should be passing
• Branch is generally up to date with main Github - definitely no conflicts
• No unnecessary whitespace changes. These make diffs harder to read and conflicts more likely.
• PR description says what changed and why, with a link to the JIRA story.
• Diff has been checked for unexpected changes being included.
• Commit messages say why the change was made.