FSPT-228: update test config to move to communities domain

[gidsg]

Change description

update test config to move to test.communities.gov.uk domain

• Unit tests and other appropriate tests added or updated
• README and other documentation has been updated / added (if needed)
• Commit messages are meaningful and follow good commit message guidelines (e.g. "FS-XXXX: Add margin to nav items preventing overlapping of logo")

How to test

after deploying services should be available on the test.communities.gov.uk domain

Screenshots of UI changes (if applicable)

[Tiny49]

LGTM