remove legacy grpc receiver endpoint for GA release

[bhautikpip]

Description: <Describe what has changed.
Removed OTLP receiver legacy endpoint which was still accepting data even after we switched to port 4317 for easy migration. Submitted a PR to remove legacy endpoint for GA release. Not sure when is the good time to merge this PR but thought this will be required before GA release.

Link to tracking Issue: #2565

Testing: Ran otlpreceiver package unit tests by running
go test -race go.opentelemetry.io/collector/receiver/otlpreceiver command

Documentation: < Describe the documentation added.>

Please delete paragraphs that you did not use before submitting.

[jpkrohling]

Do we really want to do it before GA? There are so many tools, blog posts, and docs out there referencing this port that users will be frustrated when they follow those and things don't work as expected.

[bhautikpip]

Do we really want to do it before GA? There are so many tools, blog posts, and docs out there referencing this port that users will be frustrated when they follow those and things don't work as expected.

In my opinion if we expect this change will break user's set up(in case if they are still using legacy port 55680) then might as well do it in GA release. Not sure what will change if we merge this after GA. I definitely agree on changing the documentation whenever we plan to merge this PR.

[jpkrohling]

There are things we don't control, like external blog posts. I would rather release with silent support for the legacy port, and log a big warning if we see data getting in via the legacy port.

[bhautikpip]

@bogdandrutu what is the best path forward for this issue? Not sure if there have been any discussions happening on this.

[github-actions]

This PR was marked stale due to lack of activity. It will be closed in 7 days.

[mxiamxia]

This PR can be closed and a new one - #3256 created for removing all the occurrences of the legacy port

[bogdandrutu]

@mxiamxia have you created a tracking PR for the remove of the port as we discussed after some more releases?

[github-actions]

This PR was marked stale due to lack of activity. It will be closed in 7 days.

[github-actions]

This PR was marked stale due to lack of activity. It will be closed in 7 days.

[mxiamxia]

@mxiamxia have you created a tracking PR for the remove of the port as we discussed after some more releases?

Yes, created a tracking issue - #3368

I'll send code change for deprecating the legacy host when we're ready for v0.30.0 release.

[mxiamxia]

@bhautikpip @bogdandrutu , pls close this PR.