Use separate clusters for Plus and OSS

[lucacome]

Proposed changes

The NFR tests were trying to use the same cluster for both Plus and OSS.
This fixes it.

Also changes the region to us-west1 which is a Low CO2 region.

Checklist

Before creating a PR, run through this checklist and mark each as complete.

• I have read the CONTRIBUTING doc
• I have added tests that prove my fix is effective or that my feature works
• I have checked that all unit tests pass after adding my changes
• I have updated necessary documentation
• I have rebased my branch onto main
• I will ensure my PR is targeting the main branch and pulling from my branch from my own fork

Release notes

If this PR introduces a change that affects users and needs to be mentioned in the release notes,
please add a brief note that summarizes the change.

NONE

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.62%. Comparing base (7a8eff9) to head (4576f1b).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2253   +/-   ##
=======================================
  Coverage   87.62%   87.62%           
=======================================
  Files          96       96           
  Lines        6715     6715           
  Branches       50       50           
=======================================
  Hits         5884     5884           
  Misses        774      774           
  Partials       57       57           

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