El 1218 dual deploy stg

[willc-work]

Jira ticket

Update circleci config to dual deploy to old and new namespaces
Outside of this PR:

• add context to CircleCI
• add secrets to CircleCi
• Add kube-secrets directly to namespace

Guidance to review

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.