feat: add topic grpc config and transport strategy and make sure publish deadline is set

[anitarua]

Closes Issue #1133

Publish deadline was not getting set. This PR fixes that and adds a TopicGrpcConfiguration and TopicTransportStrategy to make the publish timeout configurable.

[anitarua]

Hm, should we remove ubuntu-20.04 from github actions workflow? Can't get the 3 tests using this version to run:

This is a scheduled Ubuntu 20.04 brownout. Ubuntu 20.04 LTS runner will be removed on 2025-04-01. For more details, see actions/runner-images#11101

[malandis]

Hm, should we remove ubuntu-20.04 from github actions workflow? Can't get the 3 tests using this version to run:

This is a scheduled Ubuntu 20.04 brownout. Ubuntu 20.04 LTS runner will be removed on 2025-04-01. For more details, see actions/runner-images#11101

The only reason ubuntu-20.04 is there now is because the older python versions part of our test matrix are not bundled in ubundu-24.04. I timeboxed installing those older versions with a different method on ubuntu-24.04 but did not find an easy way. We can raise the issue again internally.