use explicit version in monitoring data sources

[danawillow]

As of #3490, we don't hardcode the version in the monitoring base path anymore because it has two different versions for GA products (v1 and v3)

Release Note Template for Downstream PRs (will be copied)

[modular-magician]

Hi! I'm the modular magician. Your PR generated some diffs in downstreams - here they are.

Diff report:

Terraform GA: Diff ( 2 files changed, 4 insertions(+), 3 deletions(-))
Terraform Beta: Diff ( 2 files changed, 4 insertions(+), 3 deletions(-))