[2151] Update all actions for OIDC

[saliceti]

Context

Authenticate Github actions to Azure with OIDC instead of service principal secret

Changes proposed in this pull request

Update all actions to remove the need for azure credentials

• The main change is in the set-arm-environment-variables and set-kubelogin-environment actions to refactor the environment variables
• Then all actions depending on them are updated
• The actions using konduit are updated to allow passing the namespace explicitly so they don't require the cluster admin role

Guidance to review

See DFE-Digital/itt-mentor-services#1253

Before merging

⚠️ Remove TEMP commit

After merging

Update DFE-Digital/itt-mentor-services#1253 to point at master

Checklist

• I have performed a self-review of my code, including formatting and typos
• I have cleaned the commit history
• I have added the Devops label
• I have attached the pull request to the trello card