Bumps to v0.120.0 for collector

[jaronoff97]

There's a bug with the newest mdatagen so I still need to import

// Had to add these two lines manually for some reason - mdatagen didn't import them properly
"go.opentelemetry.io/otel/metric"
"github.com/open-telemetry/otel-arrow/collector/processor/concurrentbatchprocessor/internal/metadata"

manually

[drewrelmas]

@jaronoff97 did you run make genotelarrowcol? When I've done these upgrades in the past this has also caused changes in collector/cmd/otelarrowcol/components.go which I don't see here. I've forgotten in the past leading to 2 PRs for the upgrade from 117 to 119: see #285 and #286.

[jaronoff97]

nope i hadn't. I just did!

[drewrelmas]

Looks good to me, thanks for beating me to it!