feat: add disk label tag to disk plugin #12594

[izenn]

this adds the functionality of being able to associate partition information with a meaningful identifier (not dm-#)

resolves #12594

created an extended struct for disk partition information that added a new field for partition label, then used the disk.Label function from github.com/shirou/gopsutil/v3/disk to populate the field if the device starts with /dev

[powersj]

Thanks for putting the PR up!

Error: plugins/inputs/conntrack/conntrack_test.go:126:7: cannot use &mps (value of type *"github.com/influxdata/telegraf/plugins/inputs/system".MockPS) as "github.com/influxdata/telegraf/plugins/inputs/system".PS value in struct literal: *"github.com/influxdata/telegraf/plugins/inputs/system".MockPS does not implement "github.com/influxdata/telegraf/plugins/inputs/system".PS (wrong type for method DiskUsage)

This is why I wanted a PR :) Since there is some mocking of the PS type used in other places, your updates may impact other plugins.

[powersj]

I'm going to close this one in favor of #12696