Update components to use gopsutil v3

[mx-psi]

Several components use gopsutil v2, which is being discontinued (shirou/gopsutil/issues/1078). We should switch them to use version 3 to be able to get security fixes. Currently the components are:

❯ find . -name go.mod | xargs grep -E 'github.com/shirou/gopsutil v3.21.8\+incompatible$' -l | sort
./exporter/signalfxexporter/go.mod
./extension/fluentbitextension/go.mod
./extension/observer/hostobserver/go.mod
./receiver/awscontainerinsightreceiver/go.mod
./receiver/hostmetricsreceiver/go.mod
./receiver/jmxreceiver/go.mod
./testbed/go.mod

To use version 3 import paths should have a /v3 ending (even if using a v3.X.Y.Z tag).

• Update gopsutil on signalfxexporter
• Update gopsutil on hostobserver
• Update gopsutil on fluentbitextension
• Update gopsutil on awscontainerinsightreceiver
• Update gopsutil on hostmetricsreceiver
• Update gopsutil on jmxreceiver
• Update gopsutil on testbed

[mustafain117]

I would like to work on this issue as a first issue, please assign this to me.

[mx-psi]

That's great @mustafain117! Assigned to you. I would do a PR for each component (you don't need to do every single one yourself, focus on one at first and continue later if you want to). Here there is more info about the changes between the v2 and v3 of gopsutil