Removing go mod replace for collector/service and collector/otelcol

[ptodev]

In the spirit of "a little copying is better than a little dependency."....

I will also make a similar change to Agent. However, in the Agent I think we will still need the "service" package to be replaced so that we can embed the OTel Collector's metrics in the Agent's /metrics endpoint.

[ptodev]

This copying is not "a little", but I think it's still better than the go mod replace 😄

[github-actions]

This PR has not had any activity in the past 30 days, so the needs-attention label has been added to it.
If you do not have enough time to follow up on this PR or you think it's no longer relevant, consider closing it.
The needs-attention label signals to maintainers that something has fallen through the cracks. No action is needed by you; your PR will be kept open and you do not have to respond to this comment. The label will be removed the next time this job runs if there is new activity.
Thank you for your contributions!

[ptodev]

I removed the batch processor replace too, because this change has been merged: #2027

[mattdurham]

Fantastic LGTM, I didnt look to closely at the forked code assumed it was the same.

[dehaansa]

To avoid copied code, I reimplemented the feature using the exported tools otelcol expects you to use in this other PR: #2148

[ptodev]

Closing this PR in favour of #2148, which doesn't require copying code 🥳