resourcemanager: move off the dependency of opencensus-go

[anderson-comvex]

Is your feature request related to a problem? Please describe.

It would prevent adding technical debt and temporary workarounds such as goroutine leak since the fix has been applied already on opentelemetry.

Describe the solution you'd like

Remove the outdated dependency of OpenCensus that have been sunset and move to OpenTelemetry. You can Read the full blog post to learn more.

Describe alternatives you've considered

• Forking the repository and maintaining its own fork.
• Added the temporary workaround

Additional context

There are several issues that have been fixed already on the OpenTelemetry library already that requires workarounds on OpenCensus, the ones that we need is specifically small but others could benefit from the maintained library instead.

[codyoss]

Our plan to remove the dependency is outlined here: https://github.com/googleapis/google-cloud-go/blob/main/debug.md#opencensus Let me know if you have any further questions not covered there.