the upstream throttling metrics should have namespace/label tags

Description of problem:

See upstream issues https://github.com/tektoncd/pipeline/issues/7878 for details

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

Steps to Reproduce

 # <steps>

Actual results:

See upstream issues https://github.com/tektoncd/pipeline/issues/7878 for details

Expected results:

Reproducibility (Always/Intermittent/Only Once):

Acceptance criteria: 

Definition of Done:

Build Details:

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

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