Description of problem:

In Overview page, on login as non-admin user and selects "All" option in Project dropdown, user is able to see data from other namespaces which user doesn't have access to. For all-namespaces, UI is sending - for namespace value and summary API is returning data for all namespaces instead of all namespaces user is having access to. 

Prerequisites (if any, like setup, operators/versions):

Steps to Reproduce

1. Install Pipelines operator
2. Install tekton results
3. Create some pipelineruns as admin user
4. Login as non-admin user, and select All in Project dropdown

Actual results:

User is able to see data from namespaces which user don't have access to

Expected results:

User should see data from namespaces which user have access to.

Reproducibility (Always/Intermittent/Only Once):

Always

Additional info (Such as Logs, Screenshots, etc):

 *